V1027 Cygni

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V1027 Cygni
V1027CygLightCurve.png
A visual band light curve for V1027 Cygni, adapted from Arkhipova et al. (2016) [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Cygnus
Right ascension 20h 02m 27.376s [2]
Declination +30° 04′ 25.49″ [2]
Apparent magnitude  (V)8.6-9.6 [1]
Characteristics
Evolutionary stage Yellow supergiant
Spectral type G7Ia [3]
U−B color index +1.9 –+2.8 [1]
B−V color index +2.1 –+2.5 [1]
Variable type L [4]
Astrometry
Proper motion (μ)RA: −2.936 [2]   mas/yr
Dec.: −5.55 [2]   mas/yr
Parallax (π)0.2390 ± 0.0178  mas [2]
Distance 14,000 ± 1,000  ly
(4,200 ± 300  pc)
Absolute magnitude  (MV)−7.956 [3]
Details
Radius 474 [5]   R☉
Luminosity 176,200 [3]   L☉
Surface gravity (log g)−0.81 [6]   cgs
Temperature 5,000 [3]   K
Other designations
HD 333385, TYC 2670-4475-1, 2MASS  J20022738+3004252
Database references
SIMBAD data

V1027 Cygni is a luminous yellow supergiant star located in the constellation of Cygnus, about 14,000 light years away. For a time, it was thought that it could be a low-mass post-AGB star, however recent parallax measurements published in Gaia DR3 have shown this to likely not be the case, and instead it is likely a massive yellow supergiant star. [3]

Contents

Properties

V1027 Cygni has a surface temperature about 5,000 K, which has been found in many studies. However, studies before Gaia DR3 generally used a distance around 1,280  pc , which led to low luminosity estimates, hence a tentative post-AGB star status. [1] Recent Gaia DR3 data shows that V1027 Cygni is likely much further away, over 4,000 pc away, which implies a much higher luminosity (about 176,000  L☉) which would place it firmly outside the post-AGB star luminosity range and in that of the more massive, younger yellow supergiants. [3] Spectral indicators of luminosity also suggest a supergiant status. [1]

Assuming a temperature of 5,000 K and a luminosity of about 176,200 L☉ for V1027 Cygni leads to a size of about 560 times that of the Sun. [lower-alpha 1] In the TESS Input Catalog (TIC) from 2019 the star's radius was calculated to be 474 R☉. [5]

Variability

When V1027 Cygni was first noticed as a variable star, it was thought to be an irregular variable, dimming and brightening erratically with no discernible period. However, in 2009, a small-amplitude period of 237 days was observed in long-term photometry of the star. [1]

Notes

  1. ↑ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772  K:

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References

  1. 1 2 3 4 5 6 7 Arkhipova, V. P.; Taranova, O. G.; Ikonnikova, N. P.; Esipov, V. F.; Komissarova, G. V.; Shenavrin, V. I.; Burlak, M. A. (2016-11-01). "Photometric and spectroscopic study of the supergiant with an infrared excess V1027 Cygni". Astronomy Letters. 42 (11): 756–773. arXiv: 1609.09279 . Bibcode:2016AstL...42..756A. doi:10.1134/S1063773716100017. ISSN   1063-7737. S2CID   119185536.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 6 Parthasarathy, M.; Kounkel, Marina; Stassun, Keivan G. (2022-10-01). "Evolutionary Status of Selected Post-AGB Stars Based on Gaia DR3". Research Notes of the American Astronomical Society. 6 (10): 210. arXiv: 2210.00890 . Bibcode:2022RNAAS...6..210P. doi:10.3847/2515-5172/ac99dd. ISSN   2515-5172. S2CID   252683050.
  4. ↑ Samus', N. N; et al. (2017). "General catalogue of variable stars". Astronomy Reports. GCVS 5.1. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID   125853869.
  5. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . ISSN   0004-6256.
  6. ↑ Fouesneau, M.; Andrae, R.; Dharmawardena, T.; Rybizki, J.; Bailer-Jones, C. A. L.; Demleitner, M. (2022). "Astrophysical parameters from Gaia DR2, 2MASS, and AllWISE". Astronomy and Astrophysics. 662: A125. arXiv: 2201.03252 . Bibcode:2022A&A...662A.125F. doi:10.1051/0004-6361/202141828. S2CID   245837778.
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