Gamma Phoenix ( γ Phoenicis , γ Phe ) is a stellar system in the constellation of Phoenix , located at a distance of about 71.63 pc from the Sun. [one]
| Gamma Phoenix | |||
|---|---|---|---|
| Star | |||
 | |||
| Observational data ( The Age of J2000) | |||
| Right ascension | 01 h 28 m 21.92727 s [1] | ||
| Declination | -43 ° 19 ′ 05.6502 ″ [1] | ||
| Visible magnitude ( V ) | 3.41 [2] | ||
| Constellation | Phoenix | ||
| Astrometry | |||
| Radial velocity ( R v ) | +25.80 [3] km / s | ||
| Proper motion (μ) | RA: -18.06 [1] mas per year Dec: -208.63 [1] mas per year | ||
| Parallax (π) | 13.96 ± 0.34 [1] mas | ||
| Absolute magnitude (V) | -0.86 [2] | ||
| Specifications | |||
| Spectral class | M0III [4] | ||
| Color Indicator ( B - V ) | +1.57 [5] | ||
| Color Index ( U - B ) | +1.85 [5] | ||
| Variability | Lb ? [6] + Ell ? [7] | ||
| physical characteristics | |||
| Weight | 1.3 / 0.6 M ☉ | ||
| Radius | 50-55 /? R ☉ | ||
| Temperature | 3802 /? K | ||
| Luminosity | 562 /? L ☉ | ||
| |||
| Information in databases | |||
| SIMBAD | data | ||
Phoenix γ is a spectral binary star and a variable star with a small amplitude. This stellar system has regular brightness variations with a period of 97.5 days according to the Hipparcos catalog, [1] but recent studies have shown that the orbital period is 193 days according to the data on the main and secondary minima. [8] Although details resembling eclipse manifestations are visible on the light curves , a high orbital inclination value suggests that variations in brightness are related to the Helisoidal nature of the stars. [7] Phoenix γ is listed in the General Catalog of Variable Stars as a likely slow irregular variable , whose apparent magnitude varies from 3.39 to 3.49, the same data also apply to eclipses or ellipsoidal variations . [6]
Only the main component of the Phoenix γ system is visible to the naked eye. The second component is detected only from variations in the radial velocity of the main star. The main star is a red giant spectral class M0III, which has exhausted its hydrogen reserves in the core, expanding and cooling as the shell source of hydrogen burns around the helium core. Estimated masses of stars are 1.3 and 0.6 solar masses . The main component has a luminosity of about five hundred times the solar. The system showed signs of coronal activity, although the main star is rather cold; this activity may be due to the accretion of the main component substance to the companion star. [7]
Notes
- ↑ 1 2 3 4 5 6 7 Van Leeuwen, F. Validation of the new Hipparcos reduction (Eng.) // Astronomy and Astrophysics . - EDP Sciences , 2007. - Vol. 474 , no. 2 - P. 653 . - DOI : 10.1051 / 0004-6361: 20078357 . - . - arXiv : 0708.1752 . Vizier catalog entry
- ↑ 1 2 Anderson, E .; Francis, Ch. XHIP: An extended hipparcos compilation (Eng.) // Astronomy Letters. - 2012. - Vol. 38 , no. 5 - P. 331 . - DOI : 10.1134 / S1063773712050015 . - . - arXiv : 1108.4971 . Vizier catalog entry
- ↑ DS; Evans. The Revision of the General Catalog of Radial Velocities (Eng.) // Determination of the Radial Velocities and their Applications: journal. - 1967. - Vol. 30 - P. 57 . - .
- ↑ Keenan, P .; McNeil, R. The Astrophysical Journal : journal. - IOP Publishing , 1989. - October ( vol. 71 ). - P. 245-266 . - DOI : 10.1086 / 191373 . - .
- ↑ 1 2 JC; Mermilliod. VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991) (Eng.) // VizieR On-line Data Catalog: II / 168. Originally published in: Institut d'Astronomie: journal. - 2006. - Vol. 2168 . - . Vizier catalog entry
- ↑ 1 2 NN; Samus; Durlevich, OV et al. VizieR Online Data Catalog: Variable Stars (Samus + 2007-2013) (Unknown) // VizieR On-line Data Catalog: B / gcvs. Originally published in: 2009yCat .... 102025S. - 2009. - Vol . 1 . - .
- ↑ 1 2 3 A .; Jorissen; Frankowski, A .; Famaey, B .; Van Eck, S. Spectroscopic binaries among Hipparcos M giants. Iii. The eccentricity - period diagram and mass-transfer signatures (English) // Astronomy and Astrophysics : journal. - EDP Sciences , 2009. - Vol. 498 , no. 2 - P. 489 . - DOI : 10.1051 / 0004-6361 / 200810703 . - . - arXiv : 0901.0938 .
- ↑ Otero, Sebastián A. New Elements for 54 Eclipsing Binaries (unknown) // Open European Journal on Variable Stars. - 2007. - October ( t. 72 , № 1 ). - p . 1-19 . - .