Gliese 752

{{Short description|Binary star system in the constellation Aquila}} {{Starbox begin}} {{Starbox image |image={{Location map|100x100|AlternativeMap=Aquila_constellation_map.svg |alt=Gliese 752 is located in the constellation Aquila |caption=Location of Gliese 752 in the constellation Aquila|border=infobox|mark=Red_pog.png|width=280 |label=Gliese 752 |position=left |lat=56.1 |long=67.3 }}|caption= }} {{Starbox observe 2s | epoch = J2000 | constell = Aquila<ref name=xhip/> | component1 = Gliese 752 A | ra1 = {{RA|19|16|55.25657}}<ref name=GaiaDR3a/> | dec1 = {{DEC|+05|10|08.0406}}<ref name=GaiaDR3a/> | appmag_v1 = ~9.12<ref name=Burt2020/> | component2 = Gliese 752 B | ra2 = {{RA|19|16|57.61096}}<ref name=GaiaDR3b/> | dec2 = {{DEC|+05|09|01.6009}}<ref name=GaiaDR3b/> | appmag_v2 = ~17.30<ref name="SIMBAD"/> }} {{Starbox character | component1 = Gliese 752 A | class = M2.5V<ref name=Burt2020/> | appmag_1_passband = B | appmag_1 = ~10.63<ref name="SIMBAD-2" /> | appmag_2_passband = V | appmag_2 = ~9.13<ref name="SIMBAD-2" /> | appmag_3_passband = R | appmag_3 = ~8.3<ref name="SIMBAD-2" /> | appmag_4_passband = J | appmag_4 = ~5.58<ref name="SIMBAD-2" /> | appmag_5_passband = H | appmag_5 = ~4.93<ref name="SIMBAD-2" /> | appmag_6_passband = K | appmag_6 = ~4.67<ref name="SIMBAD-2" /> | variable = BY<ref name="flare-2" /> | component2 = Gliese 752 B | class2 = M8V<ref name="SIMBAD"/> | appmag_1_passband2 = B | appmag_1_2 = ~19.42<ref name="SIMBAD"/> | appmag_2_passband2 = V | appmag_2_2 = ~17.30<ref name="SIMBAD"/> | appmag_3_passband2 = R | appmag_3_2 = ~15.6<ref name="SIMBAD"/> | appmag_4_passband2 = J | appmag_4_2 = 9.908 ± 0.025<ref name="SIMBAD"/> | appmag_5_passband2 = H | appmag_5_2 = 9.226 ± 0.026<ref name="SIMBAD"/> | appmag_6_passband2 = K | appmag_6_2 = 8.765 ± 0.022<ref name="SIMBAD"/> | variable2 = UV<ref name="flare-1" /> }} {{Starbox astrometry | component1 = A | radial_v = {{val|35.33|0.13}}<ref name=GaiaDR3a/> | prop_mo_ra = −579.081 | prop_mo_dec = {{val|−1332.868|fmt=commas}} | pm_footnote = <ref name=GaiaDR3a/> | parallax = 169.0615 | p_error = 0.0239 | parallax_footnote = <ref name=GaiaDR3a/> | absmag_v = {{val|10.26|0.005}}<ref name=Burt2020/> | component2 = B | radial_v2 = <!--Radial velocity (in km/sec)--> | prop_mo_ra2 = −598.761 | prop_mo_dec2 = {{val|−1366.063|fmt=commas}} | pm_footnote2 = <ref name=GaiaDR3b/> | parallax2 = 168.9537 | p_error2 = 0.0668 | parallax_footnote2 = <ref name=GaiaDR3b/> | absmag_v2 = 18.7<ref name="Biesbroeck"/> }} {{Starbox detail | component1 = Gliese 752 A | mass = {{val|0.484|0.019}}<ref name=Burt2020/> | radius = {{val|0.481|0.014}}<ref name=Burt2020/> | gravity = {{val|4.90|0.07}}<ref name=Burt2020/> | luminosity_bolometric = {{nowrap|0.0326 ± 0.0004}}<ref name="Kaminski2018"/> | temperature = {{val|3534|51|fmt=commas}}<ref name=Burt2020/> | metal = {{val|-0.04|0.16}}<ref name=Burt2020/> | rotation = {{val|50.60|0.41|u=d}}<ref name=Burt2020/> | rotational_velocity = <2<ref name=Burt2020/> | age = | component2 = Gliese 752 B | mass2 = {{val|0.0881|0.0026|0.0024}}<ref name="Pineda2021"/> | radius2 = {{val|0.1183|0.0059|0.0057}}<ref name="Pineda2021"/> | luminosity_bolometric2 = 0.000499{{±|0.000004}}<ref name="Pineda2021"/> | temperature2 = {{val|2508|63|60|fmt=commas}}<ref name="Pineda2021"/> | age_gyr2 = ~1<ref name="disc"/> }} {{Starbox catalog | names = {{odlist|CCDM=J19169+0510|GJ=752|WDS=J19169+0510|BD=+04°4048}} | component1 = Gliese 752 A | names1 = {{odlist|2MASS=J19165526+0510086|GSC=00472-01252|HD=180617|HIP=94761|Ross=652|TYC=472-1252-1|V=V1428 Aql|Wolf=1055}}<ref name="SIMBAD-2"/> | component2 = Gliese 752 B | names2 = {{odlist|2MASS=J19165762+0509021|V=V1298 Aql|name=VB 10|name2=Van Biesbroeck's Star}}<ref name="SIMBAD"/> }} {{Starbox reference | Simbad=HD+180617|sn=A | Simbad2=VB+10|sn2=VB 10 (B) | NSTED = HD-180617 }} {{Starbox end}}

'''Gliese 752''' is a binary star system in the Aquila constellation. This system is relatively nearby, at a distance of {{convert|19.3|ly|pc|lk=on|abbr=off}}.

The Gliese 752 system consists of two M-type stars. The primary star is the magnitude 9 ''Gliese (GJ) 752 A''. The secondary star is the dim magnitude 17 ''Gliese (GJ) 752 B'', more commonly referred to as ''VB 10''. This stellar pair form a binary star system separated by about 74 arc seconds (~434 AU).<ref name="Biesbroeck"/> This system is also known for its high proper motion of about 1 arc second a year. Component A has one known exoplanet. The system is unusually close (3.85 light years) to the bright star Altair, which, when seen from the system would have an apparent magnitude of around −2.43, as bright as Jupiter is from earth. {{efn|calculated using each star's distance, position in the sky, and brightness}}{{cn|date=February 2026}}

The name and number are from the ''Catalogue of Nearby Stars'', published by German astronomer Wilhelm Gliese in 1969.<ref>{{cite journal | title=Catalogue of Nearby Stars. Edition 1969 | author=Gliese, W. | author-link=Wilhelm Gliese | journal=Veröffentlichungen des Astronomischen Rechen-Instituts Heidelberg | volume=22 | series=22 | publisher=G. Braun | place=Karlsruhe | pages=117 | bibcode=1969VeARI..22....1G | url=http://www.ari.uni-heidelberg.de/publikationen/vhd/vhd022/fulltext/gif.c001.htm | year=1969 | access-date=2011-05-11 | archive-date=2012-02-18 | archive-url=https://web.archive.org/web/20120218215641/http://www.ari.uni-heidelberg.de/publikationen/vhd/vhd022/fulltext/gif.c001.htm | url-status=dead }}</ref>

{{clear|left}}

== Gliese 752 A characteristics == [[File:Gliese752LightCurve.png|thumb|left|A visual band light curve for Gliese 752 A, adapted from Weis (1994)<ref name="Weis"/>]] The primary star, also known as ''Wolf 1055'', is a type M2.5 red dwarf with about half the size and mass as the Sun and considerably cooler at {{val|3534|51|ul=K|fmt=commas}}.<ref name=Burt2020/> This star was first observed to be a high proper motion star by the German astronomer Max Wolf with his pioneering use of astrophotography. He added this star to his extensive catalog of such stars in 1919.<ref name=Wolf1919/> It is a variable star with the variable star catalog name ''V1428 Aquilae''. It is a ''BY Draconis'' type variable star subject to flare events.<ref name="SIMBAD-2"/><ref name="flare-2"/>

==Planetary system== In August 2018, a group of scientists using measurements taken from the CARMENES spectrograph, on the Calar Alto Observatory located in Spain, announced they had detected a planet orbiting the larger of the stars, HD 180617 (Gliese 752 A). The measurements indicated the presence of a planet with a minimum mass comparable to Neptune on an orbit partly located within the habitable zone.<ref name="Kaminski2018"/>

{{OrbitboxPlanet begin | name = HD 180617 (Gliese 752 A) | table_ref = <ref name=Burt2020/> }} {{OrbitboxPlanet | exoplanet = b | mass_earth = {{val|12.214|1.05|p=≥}} | period = {{val|105.911|0.109}} | semimajor = {{val|0.343|0.004}} | eccentricity = {{val|0.101|0.053}} | inclination = }} {{Orbitbox end}}

== Gliese 752 B characteristics == thumb|left|Diagram showing the relative sizes and internal dynamic processes of the two Gliese 752 stars {{Main|VB 10}} Gliese 752 was not known to be a binary star system until the discovery of a small dim secondary star by George Van Biesbroeck in 1944. This star is identified as ''VB 10'' in Van Biesbroeck's star catalog. This star is notable for its very low mass. At .08 solar masses, it is near the lower mass limit for a star. It is also quite small at 10% of the solar radius.<ref name="Biesbroeck"/> A type M8V red dwarf, the star is known for its very low luminosity (one of the least luminous stars yet observed)<ref name=probst/> with an absolute magnitude of nearly 19, due to its very cool surface temperature of only 2600K.<ref name="SIMBAD"/> It is a variable star with the variable star catalog name ''V1298 Aquilae''. This star is a ''UV Ceti'' type variable star also subject to flare events. It shares the large proper motion, along with the tendency to flare, with the primary star.<ref name="flare-1"/>

In 2009, the discovery of the extrasolar planet, ''VB 10b'', was announced in orbit around this star.<ref name="disc"/> However a subsequent spectrographic survey failed to confirm the presence of any large planets in orbit around this star.<ref name="crires-no"/>

==Magnetic field==

In 1994, the Hubble Space Telescope observed a solar flare on Gliese 752 B. This suggests that the star has a strong magnetic field, which came as a surprise to astronomers. It had previously been assumed that low mass red dwarfs would have insignificant or nonexistent magnetic fields. These tiny dwarfs are supposed to lack the radiative zone just outside the star's core that creates the magnetic field-creating dynamos in more massive stars like the Sun. Nevertheless, the detection of solar flares indicates that as yet unknown process allows low mass stars to produce sufficient magnetic fields to power such outbursts, even if solely by convection, without a radiative core.<ref>{{cite web| title = Red Dwarf Dynamo Raises Puzzle over Interiors of Lowest Mass Stars | url = http://hubblesite.org/newscenter/archive/releases/1995/03/text/| access-date = 2009-08-03| date = 1995-01-10| publisher = hubblesite|archive-url=https://web.archive.org/web/20100125212616/http://hubblesite.org/newscenter/archive/releases/1995/03/text/|archive-date=25 January 2010}}</ref>

== See also == * Binary star * List of least massive stars

==Notes== {{notelist}}

== References == <references> <ref name=GaiaDR3a>{{Cite Gaia DR3|4293318823182081408}}</ref> <ref name=GaiaDR3b>{{Cite Gaia DR3|4293315765165489536}}</ref>

<!--<ref name="Linsky">{{cite journal | title=Stellar Activity at the End of the Main Sequence: GHRS Observations of the M8 Ve Star VB 10 | last1=Linsky | first1=Jeffrey L. | last2=Wood | first2=Brian E. | last3=Brown | first3=Alexander | last4=Giampapa | first4=Mark S. | last5=Ambruster | first5=Carol | journal=The Astrophysical Journal | date= December 20, 1995 | volume=455 | pages=670–676 | doi=10.1086/176614 | bibcode=1995ApJ...455..670L | hdl=2060/19970022983 | hdl-access=free }}</ref>-->

<ref name=xhip>{{cite journal |bibcode=2012AstL...38..331A |title=XHIP: An extended hipparcos compilation |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |journal=Astronomy Letters |date=2012 |volume=38 |issue=5 |page=331 |doi=10.1134/S1063773712050015 |arxiv=1108.4971 }}</ref>

<ref name="Weis">{{cite journal | last1=Weis | first1=Edward W. | title=Long Term Variability in Dwarf M Stars | journal=Astronomical Journal | date=March 1994 | volume=107 | pages=1135–1140 | doi=10.1086/116925 | bibcode=1994AJ....107.1135W }}</ref>

<ref name="Biesbroeck">{{cite journal | title=The star of lowest known luminosity | author=van Biesbroeck, G. | journal=The Astronomical Journal | pages=61–62 | date=August 1944 | doi=10.1086/105801 | bibcode=1944AJ.....51...61V | volume=51 }}</ref>

<ref name=Wolf1919>{{cite journal |title = Starkbewegter Stern in Aquila |author = Wolf, M. |journal = Astronomische Nachrichten |volume = 209 |issue = 4 |pages = 61–62 |date = August 1919 |bibcode = 1919AN....209...61W |doi = 10.1002/asna.19192090406 }}</ref>

<ref name="SIMBAD-2">{{cite simbad | title=V* V1428 Aql | access-date=2009-05-30}}</ref>

<ref name="flare-2">{{cite web | url=http://www.sai.msu.su/groups/cluster/gcvs/cgi-bin/search.cgi?search=V1428+Aql | title=V1428 Aql | work=General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia | access-date=2009-06-06 | archive-date=2019-06-03 | archive-url=https://web.archive.org/web/20190603025045/http://www.sai.msu.su/groups/cluster/gcvs/cgi-bin/search.cgi?search=V1428+Aql | url-status=live }}</ref>

<ref name=probst>{{Cite journal|last1=Probst|first1=R. G.|last2=Liebert|first2=J.|date=1983-11-01|title=LHS 2924 : A uniquely cool low-luminosity star with a peculiar energy distribution.|journal=The Astrophysical Journal|volume=274|pages=245–251|doi=10.1086/161442|bibcode=1983ApJ...274..245P|issn=0004-637X}}</ref>

<ref name="SIMBAD">{{cite simbad | title=V* V1298 Aql | access-date=2009-05-28}}</ref>

<ref name="flare-1">{{cite web | url=http://www.sai.msu.su/groups/cluster/gcvs/cgi-bin/search.cgi?search=V1298+Aql | title=V1298 Aql | work=General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia | access-date=2009-05-28 | archive-date=2018-04-14 | archive-url=https://web.archive.org/web/20180414091931/http://www.sai.msu.su/groups/cluster/gcvs/cgi-bin/search.cgi?search=V1298+Aql | url-status=live }}</ref>

<ref name="disc">{{cite journal |title = An Ultracool Star's Candidate Planet |doi = 10.1088/0004-637X/700/1/623 |date = June 2009 |journal = The Astrophysical Journal |first1=Steven H. |last1=Pravdo |first2=Stuart B. |last2=Shaklan |arxiv = 0906.0544 |bibcode = 2009ApJ...700..623P |volume = 700 |issue = 1 |pages = 623–632 |s2cid = 119239022 }}</ref>

<ref name="crires-no">{{cite arXiv |last1=Bean |first1=Jacob L. |eprint=0912.0003v1 |title=The CRIRES Search for Planets Around the Lowest-Mass Stars. II. No Giant Planet Orbiting VB10 |class=astro-ph.EP |date=2009 |first2=Andreas |last2=Seifahrt |first3=Henrik |last3=Hartman |first4=Hampus |last4=Nilsson |first5=Ansgar |last5=Reiners |first6=Stefan |last6=Dreizler |first7=Todd J. |last7=Henry |first8=Guenter |last8=Wiedemann }}</ref>

<ref name="Kaminski2018">{{cite journal |doi=10.1051/0004-6361/201833354 |last1=Kaminski |first1=Adrian |last2=Trifonov |first2=Trifon |last3=Caballero |first3=José A. |last4=Quirrenbach |first4=Andreas |last5=Ribas |first5=Ignasi |last6=Reiners |first6=Ansgar |last7=Amado |first7=Pedro J. |last8=Zechmeister |first8=Mathias |last9=Dreizler |first9=Stefan |last10=Perger |first10=Manuel |last11=Tal-Or |first11=Lev |last12=Bonfils |first12=Xavier |last13=Mayor |first13=Michel |last14=Astudillo-Defru |first14=Nicola |last15=Bauer |first15=Florian F. |last16=Béjar |first16=Victor J. S. |last17=Cifuentes |first17=Carlos |last18=Colomé |first18=Josep |last19=Cortés-Contreras |first19=Miriam |last20=Delfosse |first20=Xavier |last21=Díez-Alonso |first21=Enrique |last22=Forveille |first22=Thierry |last23=Guenther |first23=Eike W. |last24=Hatzes |first24=Artie P. |last25=Henning |first25=Thomas K. |last26=Jeffers |first26=Sandra V. |last27=Kürster |first27=Martin |last28=Lafarga |first28=Marina |last29=Luque |first29=Rafael |last30=Mandel |first30=Holger |last31=Montes |first31=David |last32=Morales |first32=Juan Carlos |last33=Passegger |first33=Vera Maria |last34=Pedraz |first34=Sandos |last35=Reffert |first35=Sabine |last36=Sadegi |first36=Sepideh |last37=Schweitzer |first37=Andreas |last38=Seifert |first38=Walter |last39=Stahl |first39=Otmar |last40=Udry |first40=Stéphane |title=The CARMENES search for exoplanets around M dwarfs. A Neptune-mass planet traversing the habitable zone around HD 180617 |journal=Astronomy & Astrophysics |volume=618 |pages=A115 |date=3 August 2018 |arxiv=1808.01183 |bibcode=2018A&A...618A.115K |s2cid=118980171 |display-authors=1 }}</ref>

<ref name=Burt2020>{{citation|arxiv=2011.08867|title=A Collage of Small Planets from the Lick–Carnegie Exoplanet Survey: Exploring the Super-Earth and Sub-Neptune Mass Regime|year=2021|doi=10.3847/1538-3881/abc2d0|last1=Burt|first1=Jennifer|last2=Feng|first2=Fabo|last3=Holden|first3=Bradford|last4=Mamajek|first4=Eric E.|last5=Huang|first5=Chelsea X.|last6=Rosenthal|first6=Mickey M.|last7=Wang|first7=Songhu|last8=Butler|first8=R. Paul|last9=Vogt|first9=Steven S.|last10=Laughlin|first10=Gregory|last11=Henry|first11=Gregory W.|last12=Teske|first12=Johanna K.|last13=Wang|first13=Sharon X.|last14=Crane|first14=Jeffrey D.|last15=Shectman|first15=Steve A.|journal=The Astronomical Journal|volume=161|issue=1|page=10|bibcode=2021AJ....161...10B|s2cid=227013469 |doi-access=free }}</ref>

<ref name="Pineda2021">{{cite journal | title=The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars | last1=Pineda | first1=J. Sebastian | last2=Youngblood | first2=Allison | last3=France | first3=Kevin | journal=The Astrophysical Journal | volume=918 | issue=1 | id=40 | pages=23 | date=September 2021 | doi=10.3847/1538-4357/ac0aea | arxiv=2106.07656 | bibcode=2021ApJ...918...40P | s2cid=235435757 | doi-access=free }}</ref> </references>

{{Sky|19|16|58|+|05|09|02|19.292}} {{Nearest systems|3}} {{Stars of Aquila}}

Category:Aquila (constellation) 094761 Category:M-type main-sequence stars Category:Flare stars 180617 0752 Category:Binary stars Category:Planetary systems with one confirmed planet BD+04 4048 Aquilae, V1428/V1298 Category:BY Draconis variables 0652 1055