Gamma1 Caeli

Gamma1 Caeli, Latinized from γ1 Caeli, is a double star in the constellation Caelum. It consists of a K-type giant, and a G-type subgiant.

γ1 Caeli

Location of γ1 Caeli
Observation data
Epoch J2000      Equinox J2000
Constellation Caelum
γ1 Caeli A
Right ascension 05h 04m 24.40s[1]
Declination −35° 28′ 58.69″[1]
Apparent magnitude (V) 4.57±0.01[2]
γ1 Caeli B
Right ascension 05h 04m 24.19s[3]
Declination −35° 28′ 56.85″[3]
Apparent magnitude (V) 8.07±0.01[2]
Characteristics
γ1 Caeli A
Spectral type K2III-IIIb[4]
γ1 Caeli B
Spectral type G8IV[5]
Astrometry
γ1 Caeli A
Radial velocity (Rv)9.96±0.19[1] km/s
Proper motion (μ) RA: 125.430±0.283 mas/yr[1]
Dec.: −44.017±0.315 mas/yr[1]
Parallax (π)17.6430 ± 0.1673 mas[1]
Distance185 ± 2 ly
(56.7 ± 0.5 pc)
γ1 Caeli B
Proper motion (μ) RA: 123.083±0.075[3] mas/yr
Dec.: −45.344±0.100[3] mas/yr
Parallax (π)17.3832 ± 0.0490 mas[3]
Distance187.6 ± 0.5 ly
(57.5 ± 0.2 pc)
Details
γ1 Caeli A
Mass1.4+1.1
−0.4[6] M☉
Radius14.31+0.27
−0.56[1] R☉
Luminosity69.9±0.8[1] L☉
Temperature4411+89
−41[1] K
Metallicity [Fe/H]-0.1[6] dex
Rotational velocity (v sin i)<1[7] km/s
γ1 Caeli B
Mass0.91[8] M☉
Surface gravity (log g)4.45[8] cgs
Temperature5,702[8] K
Metallicity [Fe/H]-0.1[8] dex
Other designations
γ1 Cae, HIP 23595, HR 1652, SAO 195532
A: CD−35 2089A, HD 32831A, WDS J05044-3529A
B: CD−35 2089B, HD 32831B, WDS J05044-3529B
Database references
SIMBADThe system
A
B

Properties

Component A

Gamma1 Caeli A has an apparent magnitude of 4.57, which makes it barely visible to the naked eye. According to parallax, the star is located 185 light years away. Gamma1 Caeli A has a similar mass to the Sun, but expanded to 14.3 times the Sun's girth. It radiates at 69.9 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,411 K.

Component B

Gamma1 Caeli B has an apparent magnitude of 8.07, which makes it visible only in binoculars, and is located at a similar distance to Component A. It has 91% of the Sun's mass, and is metal poor, with 79% the abundance of heavy metals compared to the Sun.

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. 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. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. ISSN 0067-0049.
  5. Corbally, C. J. (1 August 1984). "Close visual binaries. I - MK classifications". The Astrophysical Journal Supplement Series. 55: 657–677. Bibcode:1984ApJS...55..657C. doi:10.1086/190973. ISSN 0067-0049.
  6. Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (1 January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. ISSN 0004-6361.
  7. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (1 January 2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
  8. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevic, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; de Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
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