# HD 101584

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/HD_101584
> Markdown URL: https://mediated.wiki/source/HD_101584.md
> Source: https://en.wikipedia.org/wiki/HD_101584
> Source revision: 1351563054
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Star in the constellation Centaurus

HD 101584 HD 101584 seen by ALMA. The blue component moves towards the observer and the red component moves away from the observer. The green component has the same speed as the binary system, seen as a green point source in the middle. Credit: ALMA (ESO/NAOJ/NRAO), Olofsson et al. Acknowledgement: Robert Cumming Observation data Epoch J2000.0 Equinox J2000.0 Constellation Centaurus Right ascension 11h 40m 58.80515s[1] Declination −55° 34′ 25.8147″[1] Apparent magnitude (V) 7.01 Characteristics Spectral type A6Ia[2] Astrometry Proper motion (μ) RA: −7.935[1] mas/yr Dec.: −0.243[1] mas/yr Parallax (π) 0.5452±0.0199 mas[1] Distance 6,000 ± 200 ly (1,830 ± 70 pc) Details supergiant Mass 0.5 - 1[3] M☉ Radius 18.6[3] R☉ Luminosity 1,600 L☉ (@1kpc) (400 - 5,000)[3] L☉ Temperature 8,500[4] K companion Mass 0.27 - 0.41[3] M☉ Other designations IRAS 11385−5517, V885 Centauri, HIP 56992, 2MASS J11405880−5534258 Database references SIMBAD data

**HD 101584** is a suspected [post-common envelope binary](/source/Post_common_envelope_binary) about 1,800 to 5,900 [light-years](/source/Light-year) distant in the constellation of [Centaurus](/source/Centaurus).[3][5] The system is bright at optical wavelengths with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of about 7. The primary is either a [post-AGB](/source/Post-AGB_Star) star, but more likely a post-[RGB](/source/Red-giant_branch) star. The secondary is a [red dwarf](/source/Red_dwarf) or possibly a low-luminosity [white dwarf](/source/White_dwarf), which orbits the primary every 150-200 days. The system is surrounded by a slowly rotating [circumbinary disk](/source/Circumstellar_disc#Binary_system), probably with a face-on orientation towards the [Solar System](/source/Solar_System) and a size of about 150 [astronomical units](/source/Astronomical_unit).[3]

## Variability

A [light curve](/source/Light_curve) for V885 Centauri, plotted from *Hipparcos* data[6]

In 1991, Jean Manfroid *et al.* published [photometry](/source/Photometry_(astronomy)) that showed that HD 101584 is a [variable star](/source/Variable_star).[7] HD 101584 has been given the [variable star designation](/source/Variable_star_designation) V885 Centauri. The International Variable Star Index states that the star varies between visual magnitude 6.90 and 7.02, over a period of 87.9 days.[8] However Koen and Eyer detected, in the star's *[Hipparcos](/source/Hipparcos)* data, an oscillation of the star's brightness with a period of 6.744 days and an amplitude of only 0.02 magnitudes.[9]

## Nebula

HD 101584 and the surrounding nebula, seen by [Hubble](/source/Hubble_Space_Telescope)

The [Hubble Space Telescope](/source/Hubble_Space_Telescope) image shows a diffuse [circumstellar](/source/Circumstellar_disc) environment with a circular ring around HD 101584. [ALMA](/source/Atacama_Large_Millimeter_Array) mapped the nebula around HD 101584 and was able to map the region close to the central binary. The nebula consists of a central compact source, an equatorial density enhancement (disk), a high-velocity bipolar outflow and an hourglass structure surrounding the outflow. The outflow reaches a maximum velocity of about 150 [km/s](/source/Km%2Fs) and is inclined to the line of sight by 10+10 −5[°](/source/Degree_(angle)). There is evidence for a second bipolar outflow with a different orientation from the major outflow.[3] The inner disk, heated to 1540 [K](/source/Kelvin), currently has been sublimated by the increasing luminosity of the star.[10]

## Evolution

The companion of this system was captured a few hundred years ago, for example when the red giant reached its critical size. It spiralled towards the red giant but stopped before it merged with the core of the primary. During this stage the outer layers of the red giant were ejected. During the [common envelope](/source/Common_envelope) phase the red giant phase of the primary was terminated and the core was revealed.[3] Later, the bipolar jets formed and met the ejected material, forming the hourglass-shaped structure.[5] Ejected material shows prominent spectral features of magnesium,[11] while outer ejected structures contain [methanol](/source/Methanol) and [formaldehyde](/source/Formaldehyde).[12]

## References

1. ^ [***a***](#cite_ref-dr3_1-0) [***b***](#cite_ref-dr3_1-1) [***c***](#cite_ref-dr3_1-2) [***d***](#cite_ref-dr3_1-3) [***e***](#cite_ref-dr3_1-4) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D5343168568718268800%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-2)** Sivarani, T.; Parthasarathy, M.; García-Lario, P.; Manchado, A.; Pottasch, S. R. (June 1999). "Spectroscopy of the post-AGB star HD 101584 (IRAS 11385-5517)". *Astronomy and Astrophysics Supplement Series*. **137** (3): 505–519. [arXiv](/source/ArXiv_(identifier)):[astro-ph/9907310](https://arxiv.org/abs/astro-ph/9907310). [Bibcode](/source/Bibcode_(identifier)):[1999A&AS..137..505S](https://ui.adsabs.harvard.edu/abs/1999A&AS..137..505S). [doi](/source/Doi_(identifier)):[10.1051/aas:1999259](https://doi.org/10.1051%2Faas%3A1999259). [ISSN](/source/ISSN_(identifier)) [0365-0138](https://search.worldcat.org/issn/0365-0138). [S2CID](/source/S2CID_(identifier)) [16274320](https://api.semanticscholar.org/CorpusID:16274320).

1. ^ [***a***](#cite_ref-Olofsson_et_al_3-0) [***b***](#cite_ref-Olofsson_et_al_3-1) [***c***](#cite_ref-Olofsson_et_al_3-2) [***d***](#cite_ref-Olofsson_et_al_3-3) [***e***](#cite_ref-Olofsson_et_al_3-4) [***f***](#cite_ref-Olofsson_et_al_3-5) [***g***](#cite_ref-Olofsson_et_al_3-6) [***h***](#cite_ref-Olofsson_et_al_3-7) Olofsson, H.; Khouri, T.; Maercker, M.; Bergman, P.; Doan, L.; Tafoya, D.; Vlemmings, W. H. T.; Humphreys, E. M. L.; Lindqvist, M.; Nyman, L.; Ramstedt, S. (March 2019). "HD 101584: circumstellar characteristics and evolutionary status". *Astronomy & Astrophysics*. **623**: A153. [arXiv](/source/ArXiv_(identifier)):[1902.02153](https://arxiv.org/abs/1902.02153). [Bibcode](/source/Bibcode_(identifier)):[2019A&A...623A.153O](https://ui.adsabs.harvard.edu/abs/2019A&A...623A.153O). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201834897](https://doi.org/10.1051%2F0004-6361%2F201834897). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361). [S2CID](/source/S2CID_(identifier)) [102480818](https://api.semanticscholar.org/CorpusID:102480818).

1. **[^](#cite_ref-4)** Olofsson, H.; Black, J. H.; Khouri, T.; Vlemmings, W. H. T.; Humphreys, E. M. L.; Lindqvist, M.; Maercker, M.; Nyman, L.; Ramstedt, S.; Tafoya, D. (2021). "Heavy-element Rydberg transition line emission from the post-giant-evolution star HD 101584". *Astronomy and Astrophysics*. **651**: A35. [arXiv](/source/ArXiv_(identifier)):[2105.00699](https://arxiv.org/abs/2105.00699). [Bibcode](/source/Bibcode_(identifier)):[2021A&A...651A..35O](https://ui.adsabs.harvard.edu/abs/2021A&A...651A..35O). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202140537](https://doi.org/10.1051%2F0004-6361%2F202140537). [S2CID](/source/S2CID_(identifier)) [233481052](https://api.semanticscholar.org/CorpusID:233481052).

1. ^ [***a***](#cite_ref-ALMA_press_5-0) [***b***](#cite_ref-ALMA_press_5-1) ["ALMA catches beautiful outcome of stellar fight"](https://www.almaobservatory.org/en/audiences/alma-catches-beautiful-outcome-of-stellar-fight/). *Atacama Large Millimeter/submillimeter Array*.

1. **[^](#cite_ref-CDS_6-0)** ["/ftp/cats/more/HIP/cdroms/cats"](https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats). *Centre de Données astronomiques de Strasbourg*. Strasbourg astronomical Data Center. Retrieved 15 October 2022.

1. **[^](#cite_ref-Manfroid1991_7-0)** Manfroid, J.; Sterken, C.; Bruch, A.; Burger, M.; de Groot, M.; Duerbeck, H. W.; Duemmler, R.; Figer, A.; Hageman, T.; Hensberge, H.; Jorissen, A.; Madejsky, R.; Mandel, H.; Ott, H. A.; Reitermann, A.; Schulte-Ladbeck, R. E.; Stahl, O.; Steenman, H.; Vander Linden, D.; Zickgraf, F. J. (March 1991). ["Long-term photometry of variables at ESO. I. The first data catalogue (1982-1986)"](https://articles.adsabs.harvard.edu/pdf/1991A%26AS...87..481M). *Astronomy and Astrophysics, Suppl. Ser*. **87**: 481–498. [Bibcode](/source/Bibcode_(identifier)):[1991A&AS...87..481M](https://ui.adsabs.harvard.edu/abs/1991A&AS...87..481M). Retrieved 20 January 2025.

1. **[^](#cite_ref-IVSI_8-0)** ["V0885 Cen"](https://www.aavso.org/vsx/index.php?view=detail.top&oid=8182). *The International Variable Star Index*. AAVSO. Retrieved 21 October 2022.

1. **[^](#cite_ref-Koen_9-0)** Koen, Chris; Eyer, Laurent (March 2002). ["New periodic variables from the Hipparcos epoch photometry"](https://doi.org/10.1046%2Fj.1365-8711.2002.05150.x). *Monthly Notices of the Royal Astronomical Society*. **331** (1): 45–59. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0112194](https://arxiv.org/abs/astro-ph/0112194). [Bibcode](/source/Bibcode_(identifier)):[2002MNRAS.331...45K](https://ui.adsabs.harvard.edu/abs/2002MNRAS.331...45K). [doi](/source/Doi_(identifier)):[10.1046/j.1365-8711.2002.05150.x](https://doi.org/10.1046%2Fj.1365-8711.2002.05150.x).

1. **[^](#cite_ref-10)** Kluska, J.; Olofsson, H.; Van Winckel, H.; Khouri, T.; Wittkowski, M.; De Wit, W. J.; Humphreys, E. M. L.; Lindqvist, M.; Maercker, M.; Ramstedt, S.; Tafoya, D.; Vlemmings, W. H. T. (2020), "VLTI/PIONIER reveals the close environment of the evolved system HD 101584", *Astronomy & Astrophysics*, **642**: A152, [arXiv](/source/ArXiv_(identifier)):[2008.11555](https://arxiv.org/abs/2008.11555), [Bibcode](/source/Bibcode_(identifier)):[2020A&A...642A.152K](https://ui.adsabs.harvard.edu/abs/2020A&A...642A.152K), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202037946](https://doi.org/10.1051%2F0004-6361%2F202037946), [S2CID](/source/S2CID_(identifier)) [221319788](https://api.semanticscholar.org/CorpusID:221319788)

1. **[^](#cite_ref-11)** [Heavy-element Rydberg transition line emission from the post-giant-evolution star HD 101584](https://www.aanda.org/articles/aa/abs/2021/07/aa40537-21/aa40537-21.html)

1. **[^](#cite_ref-12)** Basalgète, R.; Dupuy, R.; Féraud, G.; Romanzin, C.; Philippe, L.; Michaut, X.; Michoud, J.; Amiaud, L.; Lafosse, A.; Fillion, J.-H.; Bertin, M. (2021), "Complex organic molecules in protoplanetary disks: X-ray photodesorption from methanol-containing ices", *Astronomy & Astrophysics*, **647**: A35, [arXiv](/source/ArXiv_(identifier)):[2101.06179](https://arxiv.org/abs/2101.06179), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202039676](https://doi.org/10.1051%2F0004-6361%2F202039676), [S2CID](/source/S2CID_(identifier)) [231627611](https://api.semanticscholar.org/CorpusID:231627611)

v t e Constellation of Centaurus List of stars in Centaurus Centaurus in Chinese astronomy Stars Bayer α A (Rigil Kentaurus) B (Toliman) C (Proxima Centauri) β (Hadar) γ δ ε ζ (Leepwal) η θ (Menkent) ι (Kulou) κ λ μ ν (Heng) ξ1 ξ2 ο1 ο2 π ρ σ τ υ1 υ2 φ χ ψ x1 x2 C3 D E F G H J K M N Q Flamsteed 1 (i) 2 (g) 3 (k) 4 (h) Variable R T V Y RR SV SX BV DY UY V346 V553 V744 V752 V761 (a) V763 (C1) V766 V779 (Krzemiński's star) V803 V810 V816 (Przybylski's Star) V831 V842 V885 V886 V863 V1032 V1369 V1400 V1935 HR 4460 (A) 4466 (C2) 4499 4522 4523 4537 (j) 4546 (B) 4721 4748 (u) 4796 4817 (l) 4831 (w) 4874 (p) 4888 (e) 4889 (n) 4940 (f) 4979 4989 5006 (r) 5041 (m) 5089 (d) 5174 (z) 5222 (y) 5224 5241 5297 5358 (v) 5371 5471 (b) 5485 (c1) 5489 (c2) HD 97413 98176 100453 101581 101930 102117 (Uklun) 103197 107914 108236 109749 110113 113538 113766 114386 114729 115600 116434 (Matza) 117207 117618 (Dofida) 117939 120411 121228 121504 124448 (Popper's Star) 125072 125595 131399 Other 2MASS J1126−5003 2M1207 Gaia BH2 HD 131399 Ab PSR B1259−63 PSR J1311−3430 TOI-763 WASP-15 (Nyamien) WASP-41 WASP-42 WASP-167/KELT-13 Exoplanets 2M1207b b Centauri b HD 101930 b HD 102117 b (Leklsullun) HD 103197 b HD 109749 b HD 113538 b c HD 114386 b HD 114729 b HD 117207 b HD 117618 b (Noifasui) HD 121504 b HIP 65426 b (Najsakopajk) HIP 67522 b NGTS-13b Proxima Centauri b c d WASP-15b (Asye) Star clusters NGC 3766 4230 4507 5281 5286 5316 5460 5617 5662 Other IC 2944 ω Centauri Scorpius–Centaurus association Stock 16 Nebulae NGC 3918 5307 Other Boomerang Nebula Fleming 1 G292.0+1.8 G306.3-0.9 Gum 41 IC 2944 IRAS 13208−6020 RCW 79 RCW 86 Southern Crab Nebula SuWt 2 Galaxies NGC 3557 3568 3749 3783 4444 4603 4622 4650A 4683 4696 4706 4709 4729 4730 4743 4744 4909 4930 4945 4976 5011 A 5026 5064 5082 5090 5091 5102 5114 5121 5128 (Centaurus A) 5161 5206 5253 5266 5291 5398 5408 5419 5483 5516 Other ESO 269-57 ESO 325-4 ESO 383-76 ESO 444-46 Fourcade-Figueroa Object IC 3370 IC 4214 IC 4329A IRAS 13224−3809 J1144−4308 LEDA 677373 PKS 1144−379 PKS 1353−341 PKS 1424−418 Galaxy clusters Abell S740 Centaurus Cluster Shapley Supercluster Astronomical events GW190521 SN 185 SN 1895B (Z) SN 1972E SN 1986G J1407b SN 2019so Category

---
Adapted from the Wikipedia article [HD 101584](https://en.wikipedia.org/wiki/HD_101584) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_101584?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.