Astronomy:Gamma1 Caeli
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| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}} | |
|---|---|
| Constellation | Caelum |
| γ1 Caeli A | |
| Right ascension | 05h 04m 24.402s[1] |
| Declination | −35° 28′ 58.71″[1] |
| Apparent magnitude (V) | 4.57±0.01[2] |
| γ1 Caeli B | |
| Right ascension | 05h 04m 24.191s[3] |
| Declination | −35° 28′ 56.86″[3] |
| Apparent magnitude (V) | 8.07±0.01[2] |
| Characteristics | |
| γ1 Caeli A | |
| Spectral type | K2III-IIIb[4] |
| U−B color index | 1.197[5] |
| B−V color index | 1.198[5] |
| γ1 Caeli B | |
| Spectral type | G8IV[6] |
| B−V color index | 0.84[2] |
| Astrometry | |
| γ1 Caeli A | |
| Radial velocity (Rv) | 9.96±0.19[7] km/s |
| Proper motion (μ) | RA: 125.972[7] mas/yr Dec.: −42.909[7] mas/yr |
| Parallax (π) | 17.5912 ± 0.0834[1] mas |
| Distance | 185.4 ± 0.9 ly (56.8 ± 0.3 pc) |
| γ1 Caeli B | |
| Proper motion (μ) | RA: 123.107 mas/yr Dec.: −45.167 mas/yr |
| Parallax (π) | 17.5332 ± 0.024[3] mas |
| Distance | 186.0 ± 0.3 ly (57.03 ± 0.08 pc) |
| Details | |
| γ1 Caeli A | |
| Mass | 1.4+1.1 −0.4[8] M☉ |
| Radius | 14.31+0.27 −0.56[7] R☉ |
| Luminosity | 69.9±0.8[7] L☉ |
| Temperature | 4,411+89 −41[7] K |
| Metallicity [Fe/H] | −0.1[8] dex |
| Rotational velocity (v sin i) | <1[9] km/s |
| γ1 Caeli B | |
| Mass | 0.91[10] M☉ |
| Surface gravity (log g) | 4.45[10] cgs |
| Temperature | 5,702[10] K |
| Metallicity [Fe/H] | −0.1[10] dex |
| Other designations | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
Gamma1 Caeli is a double star in the southern constellation of Caelum. Its name is a Bayer designation that is Latinized from γ1 Caeli, and abbreviated Gamma1 Cae or γ1 Cae. This pair consists of an orange hued giant and a fainter yellow subgiant star with an angular separation of 3.20″, as of 2016.[11] The brighter component is faintly visible to the naked eye with an apparent visual magnitude of 4.57.[2] Based on parallax measurements, it is located at a distance of approximately 185 light-years (57 pc) from the Earth. This star is drifting further away from the Sun with a radial velocity of +10 km/s.[7]
Properties
Gamma1 Caeli A is an evolved K-type giant star with a stellar classification of K2III-IIIb.[4] It is 40% more massive than the Sun and has expanded to 14.3 times the Sun's girth. This star is radiates 69.9 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,411 K. It is metal poor, with 79% the abundance of elements more massive than helium compared to the Sun.
Gamma1 Caeli B has an apparent magnitude of 8.07, which makes it visible only in binoculars or a telescope, and is located at a similar distance to Component A with a comparable proper motion. It has a class of G8IV,[6] matching an aging G-type subgiant star that has exhausted the supply of hydrogen at its core and is evolving away from the main sequence. This star has 91% of the Sun's mass.
References
- ↑ 1.0 1.1 1.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Høg, E. et al. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 3.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (1 October 1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series 71: 245–266. doi:10.1086/191373. ISSN 0067-0049. Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 Paczynski, B. et al. (September 1999). "The Optical Gravitational Lensing Experiment. UBVI Photometry of Stars in Baade's Window". Acta Astronomica 49: 319–339. Bibcode: 1999AcA....49..319P.
- ↑ 6.0 6.1 Corbally, C. J. (1 August 1984). "Close visual binaries. I - MK classifications". The Astrophysical Journal Supplement Series 55: 657–677. doi:10.1086/190973. ISSN 0067-0049. Bibcode: 1984ApJS...55..657C.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 8.0 8.1 Charbonnel, C. et al. (1 January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics 633: A34. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. Bibcode: 2020A&A...633A..34C.
- ↑ De Medeiros, J. R. et al. (1 January 2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D.
- ↑ 10.0 10.1 10.2 10.3 Anders, F. et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A.
- ↑ Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
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