HD 80194

HD 80194

Observation data Epoch J2000       Equinox J2000
Constellation	Chamaeleon [1]
Right ascension	09h 12m 12.3671s [2]
Declination	−76° 39′ 46.9007″ [2]
Apparent magnitude  (V)	6.12±0.01 [3]
Characteristics
Evolutionary stage	Horizontal branch [4]
Spectral type	K1 III [5]
U−B color index	+0.99 [6]
B−V color index	+1.09 [6]
Astrometry
Radial velocity (Rv)	0.9±0.4 [7] km/s
Proper motion (μ)	RA: +39.844 mas/yr [2] Dec.: −43.834 mas/yr [2]
Parallax (π)	9.2743±0.02  mas [2]
Distance	351.7 ± 0.8  ly (107.8 ± 0.2  pc)
Absolute magnitude  (MV)	+0.75 [1]
Details
Mass	1.15 [8]   M☉
Radius	9.82 [9]   R☉
Luminosity	47±2 [10]   L☉
Surface gravity (log g)	2.43 [8]   cgs
Temperature	4,798±122 [11]   K
Metallicity [Fe/H]	−0.09 [12]   dex
Rotational velocity (v sin i)	<1 [13]  km/s
Other designations
12 G. Chamaeleontis, CD−76°416, CPD−76°574, FK5 2735, GC 12766, HD 80194, HIP 45166, HR 3695, SAO 256594 [14] [15]
Database references
SIMBAD	data

HD 80194 (HR 3695) is a solitary star in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.12, ^[3] allowing it to be faintly seen with the naked eye. Parallax measurements place the object at a distance of 351 light years ^[2] and is currently receding with a poorly constrained radial velocity of 0.9  km/s . ^[7]

HD 80194 has a stellar classification of K1 III, ^[5] indicating that it is a red giant that has exhausted its core hydrogen. It is thought to be a red clump star, on the cool end of the horizontal branch and fusing helium in its core. ^[4] It has 115% the mass of the Sun ^[8] but has expanded to 9.82 times its girth. ^[9] It shines at 47 times the luminosity of the Sun ^[10] from its photosphere at an effective temperature of 4,798  K , ^[11] giving it an orange glow. HD 80194 has an iron abundance 81% that of the Sun ^[12] and spins slowly with a projected rotational velocity lower than 1  km/s . ^[13]

References

1. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
2. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
3. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (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.
4. Laney, C. D.; Joner, M. D.; Pietrzyński, G. (11 November 2011). "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars". Monthly Notices of the Royal Astronomical Society. 419 (2): 1637–1641. arXiv: 1109.4800 . Bibcode:2012MNRAS.419.1637L. doi: 10.1111/j.1365-2966.2011.19826.x . ISSN   0035-8711.
5. Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
6. Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
7. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN   1063-7737. S2CID   119231169.
8. Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . ISSN   0004-6361.
9. Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
10. Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics. 633: A34. arXiv: 1910.12732 . Bibcode:2020A&A...633A..34C. doi: 10.1051/0004-6361/201936360 . eISSN   1432-0746. ISSN   0004-6361.
11. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . ISSN   0004-6256.
12. Eggen, O. J. (July 1993). "Evolved GK stars near the sun. I - The old disk population". The Astronomical Journal. 106: 80. Bibcode:1993AJ....106...80E. doi: 10.1086/116622 .
13. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . ISSN   0004-6361.
14. "HD 80194". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 6 June 2022.
15. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.