V810 Centauri ( lat.V810 Centauri ) is a double star consisting of a yellow supergiant (main component, V810 Cen A) and a blue giant (second component, V810 Cen B). It is a variable star with a small amplitude, mainly due to a supergiant superior in magnitude by 3 magnitudes to the second component in brightness. [7]
| V810 Centauri A / B | |||
|---|---|---|---|
| Star | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 3300-3500 pc [2] | ||
| Visible magnitude ( V ) | 5,021 var [2] | ||
| Constellation | Centaurus | ||
| Astrometry | |||
| Radial velocity ( R v ) | 16.44 [3] km / s | ||
| Own movement (μ) | RA: –5.74 ± 0.21 [1] Dec: 1.30 ± 0.17 [1] | ||
| Parallax (π) | 0.46 ± 0.22 [1] mas | ||
| Absolute magnitude (V) | -8.4 / -5.1 [2] | ||
| Characteristics | |||
| Spectral class | F8Ia + B0III [2] | ||
| Color Index ( B - V ) | 0.014 [2] | ||
| Color Index ( U - B ) | 1,762 [2] | ||
| Variability | SRd [5] | ||
| physical characteristics | |||
| Weight | 20/25 [2] M ☉ | ||
| Radius | 420/14 R ☉ | ||
| Temperature | 6010/29 000 K | ||
| Luminosity | 200 000/125 000 L ☉ | ||
| Metallicity | and | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
V810 Cen A exhibits semi-regular gloss variations with several components over a period. The main mode is about 156 days and corresponds to the main (fundamental) mode of radial pulsations of classical Cepheids . In the absence of other pulsation modes, the object could be considered a classical Cepheid. Other pulsation modes also appear and have periods from 89 to 234 days, the most powerful modes are, in all probability, a non-radial p-mode with a period of 107 days and a non-radial g-mode with a period of 185 days. [2]
The blue giant has almost the same mass and luminosity as the main component, but the brightness of the object seems less. The main component is supposed to have lost about 5 M ☉ since its existence in the main sequence , it has expanded and lowered temperature, and is currently located on the blue edge of the Cepheid instability band . It is expected that the star will no longer cool and can draw a blue loop on the diagram, while slightly increasing the luminosity. [2]
Previously, V810 Cen was believed to be part of the Stock 14 open cluster at a distance of 2.6 kpc from the Sun, [8] but currently the star is considered a more distant object. The distance obtained by the spectrophotometric method is greater than the value obtained by measuring the parallax by the Hipparcos spacecraft , but within the measurement errors.
Notes
- ↑ 1 2 3 4 5 Van Leeuwen, F. Validation of the new Hipparcos reduction (Eng.) // Astronomy and Astrophysics : journal. - 2007. - Vol. 474 , no. 2 . - P. 653-664 . - DOI : 10.1051 / 0004-6361: 20078357 . - . - arXiv : 0708.1752 .
- ↑ 1 2 3 4 5 6 7 8 9 F .; Kienzle; Burki, G .; Burnet, M .; Meynet, G. The pulsating yellow supergiant V810 Centauri (Eng.) // Astronomy and Astrophysics : journal. - 1998. - Vol. 337 . - P. 779 . - . - arXiv : astro-ph / 9807088 .
- ↑ JC; Mermilliod; Mayor, M .; Udry, S. Red giants in open clusters. Xiv. Mean radial velocities for 1309 stars and 166 open clusters // Astronomy and Astrophysics : journal. - 2008. - Vol. 485 . - P. 303-314 . - DOI : 10.1051 / 0004-6361: 200809664 . - .
- ↑ 1 2 3 4 Collaboration G. Gaia DR2 - 2018 .-- Vol. 1345.
- ↑ NN; Samus; Durlevich, OV et al. VizieR Online Data Catalog: General Catalog of Variable Stars (Samus + 2007-2013) (neopr.) // VizieR On-line Data Catalog: B / gcvs. Originally published in: 2009yCat .... 102025S. - 2009 .-- T. 1 . - .
- ↑ 1 2 R. Earle Luck Parameters and abundances in luminous stars // Astron. J. / J. G. III - IOP Publishing , 2014 .-- Vol. 147, Iss. 6. - P. 137. - ISSN 0004-6256 ; 1538-3881 - doi: 10.1088 / 0004-6256 / 147/6/137
- ↑ W .; Eichendorf; Lub, J .; Pakull, M .; Heck, A .; Isserstedt, J .; Reipurth, B .; Van Genderen, AM On the nature of the 125-day Cepheid V 810 CEN / equals HR 4511 / - IUE spectra (Eng.) // Astronomy and Astrophysics : journal. - 1981. - Vol. 93 . - P. L5 . - .
- ↑ DG; Turner New UBV photometry for the open cluster Stock 14 and its Cepheid-like variable V810 Centauri / = HR 4511 / (Eng.) // Publications of the Astronomical Society of the Pacific : journal. - 1982. - Vol. 94 . - P. 655 . - DOI : 10.1086 / 131039 . - .