Gamma Phoenicis
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Double star γ Phoenicis |
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| AladinLite | |||||||||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Phoenix | ||||||||||||||||||
| Right ascension | 01 h 28 m 21.93 s | ||||||||||||||||||
| declination | -43 ° 19 ′ 5.7 ″ | ||||||||||||||||||
| Apparent brightness | 3.41 (3.39 to 3.49) mag | ||||||||||||||||||
| Typing | |||||||||||||||||||
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rel. Brightness (G-band) |
(2.56 ± 0.01) mag | ||||||||||||||||||
| rel. Brightness (J-band) |
(0.61 ± 0.22) mag | ||||||||||||||||||
| B − V color index | (+1.57) | ||||||||||||||||||
| Spectral class | M0 IIIa | ||||||||||||||||||
| Variable star type | EB / GS + LB | ||||||||||||||||||
| Astrometry | |||||||||||||||||||
| Radial velocity | (25.8 ± 0.9) km / s | ||||||||||||||||||
| parallax | (13.96 ± 0.34) mas | ||||||||||||||||||
| distance | (234 ± 6) ly (72) pc |
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| Proper movement | |||||||||||||||||||
| Rec. Share: | (−18.06 ± 0.28) mas / a | ||||||||||||||||||
| Dec. portion: | (−208.63 ± 0.28) mas / a | ||||||||||||||||||
| Physical Properties | |||||||||||||||||||
| Dimensions | (1.3 / 0.6) M ☉ | ||||||||||||||||||
| radius | (50) R ☉ | ||||||||||||||||||
| Luminosity |
(560) L ☉ |
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| Effective temperature | (3800) K | ||||||||||||||||||
| Age | (5.5) bill. A | ||||||||||||||||||
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Other names and catalog entries |
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γ Phoenicis is a spectroscopic binary star in the constellation Phoenix at a distance of about 235 light years . The bright main star is a red giant of the spectral class M0 IIIa and also changeable , whereby a period of about 194 days can be recognized in the light curve . Little is known about the companion; it orbits the bright star at a distance of about 0.65 AU . Together they form a system of the Beta Lyrae type . Possibly the companion accreted mass from the red giant, which could explain the observed stellar activity in the system.
Individual evidence
- ↑ a b c d e f g h gam Phe. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on August 1, 2019 .
- ↑ a b c d gam Phe. In: VSX. AAVSO , accessed August 1, 2019 .
- ↑ a b c d e A. Jorissen, A. Frankowski, B. Famaey, S. Van Eck: Spectroscopic binaries among Hipparcos M giants. III. The eccentricity - period diagram and mass-transfer signatures . In: Astronomy & Astrophysics . 498, No. 2, 2009, p. 489. arxiv : 0901.0938 . bibcode : 2009A & A ... 498..489J . doi : 10.1051 / 0004-6361 / 200810703 .
- ↑ a b Gamma Phoenicis. Jim Kaler, accessed August 1, 2019 .