{{short description|Variable star in the constellation Taurus}} {{About-distinguish|p Tauri|ρ Tauri}} {{Starbox begin}} {{Starbox image | image = 250px | caption = A light curve for IM Tauri, plotted from ''TESS'' data.<ref name=MAST/> The 3.479 hour period<ref name="IVSI"/> is marked in red. }} {{Starbox observe | epoch = J2000.0 | ra = {{RA|04|10|49.86084}}<ref name=dr3/> | dec = {{DEC|+26|28|51.4365}}<ref name=dr3/> | appmag_v = 5.37 - 5.58<ref name=gcvs/> | constell = Taurus }} {{Starbox character | type = main sequence<ref name=dr3/><ref name=Zorec2012/> | class = F2 IV<ref name="Lenz2010"/> | b-v = | u-b = | variable = δ Scuti<ref name=gcvs/> }} {{Starbox astrometry | radial_v = {{val|17.43|0.64}}<ref name=dr3/> | prop_mo_ra = {{val|-30.919|0.123}}<ref name=dr3/> | prop_mo_dec = {{val|-35.105|0.072}}<ref name=dr3/> | parallax = 15.4199 | p_error = 0.0863 | parallax_footnote = <ref name=dr3/> | absmag_v = {{val|1.44|0.16}}<ref name="Civelek2001"/> }} {{Starbox detail | source = | component1 = Primary | mass = 1.89<ref name="Civelek2001"/> | radius = | luminosity = | temperature = {{val|7000|200}}<ref name="Lenz2007"/> | metal_fe = | gravity = {{val|3.6|0.1}}<ref name="Lenz2010"/> | rotational_velocity = {{val|2|1}}<ref name="Lenz2007"/> | rotation = | age_gyr = }} {{Starbox catalog | names = p Tauri, IM Tauri, BD+26 411, HIP 19513, HD 26322, HR 1287, SAO 76485<ref name=SIMBAD/> }} {{Starbox reference | Simbad = IM+Tau }} {{Starbox end}}
'''44 Tauri''', also known as '''HD 1287''' and '''IM Tauri''', is a star located about 210 light years from the Earth, in the constellation Taurus.<ref name=dr3/> It is a 5th magnitude star, making it faintly visible to the naked eye of an observer located far from city lights. It is a Delta Scuti variable star, ranging between magnitude 5.37 and 5.58 over a period of about 3.5 hours.<ref name=gcvs/>
In 1966, Ivan Danziger and Robert Dickens discovered that 44 Tauri was a low amplitude variable star, with a period of approximately 3.22 hours.<ref name="Danziger1966"/> In a follow-up study published the next year, they reported that the period was irregular, indicating beat phenomena, and they classified it as a δ Scuti variable.<ref name="Danziger1967"/> In 1968, 44 Tauri was given the variable star designation IM Tauri.<ref name="Kukarkin1968"/>
44 Tauri has been a popular object for detailed astroseismic and spectroscopic studies, because its very slow (relative to other δ Scuti stars) rotation speed of {{val|3|2}} km/sec does not complicate pulsation mode identification or greatly broaden spectral lines.<ref name="Lenz2010"/><ref name="Lenz2007"/><ref name="Zima2007"/> As of 2010, 44 Tauri had been found to pulsate with 15 independent periods, ranging from 1.89 to 4.52 hours.<ref name="Lenz2010"/>
==References== {{Reflist|30em|refs=
<ref name="IVSI">{{cite web | title=IM Tau | url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=35247 | website=The International Variable Star Index | publisher=AAVSO | access-date=19 January 2023}}</ref>
<ref name=MAST>{{cite web | title=MAST: Barbara A. Mikulski Archive for Space Telescopes | url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html | publisher=Space Telescope Science Institute |access-date=16 January 2023}}</ref>
<ref name=dr3>{{cite Gaia DR3|162405533940990080}}</ref>
<ref name=gcvs>{{cite journal | bibcode=2017ARep...61...80S | title=General catalogue of variable stars: Version GCVS 5.1 | last1=Samus' | first1=N. N. | last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V. | last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N. | journal=Astronomy Reports | year=2017 | volume=61 | issue=1 | page=80 | doi=10.1134/S1063772917010085 | s2cid=125853869 | doi-access=free }}</ref>
<ref name=SIMBAD>{{cite simbad | title=p Tau -- delta Sct Variable | access-date=2023-01-19}}</ref>
<ref name="Danziger1966">{{cite journal | last1=Danziger | first1=I. J. | last2=Dickens | first2=R. J. | bibcode=1966IBVS..150....1D | title=Observations of Variable F-Type Stars with Short Periods | journal=Information Bulletin on Variable Stars | date=August 1966 | volume=150 | page=1 }}</ref>
<ref name="Danziger1967">{{cite journal | last1=Danziger | first1=I. J. | last2=Dickens | first2=R. J. | title=Spectrophotometry of New Short-Period Variable Stars | journal=Astrophysical Journal | date=July 1967 | volume=149 | pages=55–72 | doi=10.1086/149231 | bibcode=1967ApJ...149...55D | doi-access=free }}</ref>
<ref name="Kukarkin1968">{{cite journal | last1=Kukarkin | first1=B. V. | last2=Efremov | first2=Yu. N. | last3=Frolov | first3=M. S. | last4=Medvedeva | first4=G. I. | last5=Kholopov | first5=P. N. | last6=Kurochkin | first6=N. E. | last7=Kukarkina | first7=N. P. | last8=Perova | first8=N. B. | last9=Fedorovich | first9=V. P. | bibcode=1968IBVS..311....1K | title=Identification List of the New Variable Stars Nominated in 1968 | journal=Information Bulletin on Variable Stars | date=November 1968 | volume=311 | page=1 }}</ref>
<ref name="Lenz2010">{{cite journal | last1=Lenz | first1=P. | last2=Pamyatnykh | first2=A. A. | last3=Zdravkov | first3=T. | last4=Breger | first4=M. | title=A δ Scuti star in the post-MS contraction phase: 44 Tauri | journal=Astronomy and Astrophysics | date=January 2010 | volume=509 | pages=A90 | doi=10.1051/0004-6361/200912914 | arxiv=0911.4339 | bibcode=2010A&A...509A..90L | s2cid=119311255 }}</ref>
<ref name="Lenz2007">{{cite journal | last1=Lenz | first1=P. | last2=Pamyatnykh | first2=A. A. | last3=Zdravkov | first3=T. | last4=Breger | first4=M. | title=High-resolution spectroscopy of the δ Scuti star 44 Tauri: photospheric element abundances and mode identification | journal=Astronomy and Astrophysics | date=August 2007 | volume=471 | issue=1 | pages=237–245 | doi=10.1051/0004-6361/200912914 | arxiv=0911.4339 | bibcode=2010A&A...509A..90L | s2cid=119311255 }}</ref>
<ref name="Zima2007">{{cite journal | last1=Zima | first1=W. | last2=Lehmann | first2=H. | last3=Stütz | first3=Ch. | last4=Ilyin | first4=I. V. | last5=Breger | first5=M. | title=High-resolution spectroscopy of the δ Scuti star 44 Tauri: photospheric element abundances and mode identification | journal=Astronomy and Astrophysics | date=August 2007 | volume=471 | issue=1 | pages=237–245 | doi=10.1051/0004-6361:20077201 | bibcode=2007A&A...471..237Z }}</ref>
<ref name="Civelek2001">{{cite journal | last1=Civelek | first1=R. | last2=Kızıloğlu | first2=N. | last3=Kırbıyık | first3=H. | title=Radial and Nonradial Oscillations of 44 Tauri | journal=The Astronomical Journal | date=October 2001 | volume=122 | issue=4 | pages=2042–2046 | doi=10.1086/323078 | bibcode=2001AJ....122.2042C | s2cid=122087742 | doi-access=free | hdl=11511/66296 | hdl-access=free }}</ref>
<ref name=Zorec2012>{{cite journal | last1=Zorec | first1=J. | last2=Royer | first2=F. | title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities | journal=Astronomy & Astrophysics | volume=537 | page=A120 | date=January 2012 | doi=10.1051/0004-6361/201117691 | bibcode=2012A&A...537A.120Z | arxiv=1201.2052 | s2cid=55586789 }}</ref>
}}
{{Stars of Taurus}}
Category:Taurus (constellation) 019513 026322 Category:Durchmusterung objects Tauri, IM Tauri, 044 Category:Delta Scuti variables Category:F-type subgiants Tauri, p