Astronomy:HD 30080

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Short description: Star in the constellation of Caelum
HD 30080
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Caelum
Right ascension  04h 43m 09.29298s[1]
Declination −30° 45′ 56.0166″[1]
Apparent magnitude (V) 5.66±0.01[2]
Characteristics
Evolutionary stage red giant branch[1]
Spectral type K3 III[3]
U−B color index +1.60[4]
B−V color index +1.39[4]
Astrometry
Radial velocity (Rv)−3.8±2.9[5] km/s
Proper motion (μ) RA: −30.790[1] mas/yr
Dec.: −67.724[1] mas/yr
Parallax (π)5.326 ± 0.0417[1] mas
Distance612 ± 5 ly
(188 ± 1 pc)
Absolute magnitude (MV)−0.8[6]
Details
Mass1.16[7] M☉
Radius41.62[8] R☉
Luminosity299±5[9] L☉
Surface gravity (log g)1.40[7] cgs
Temperature4,262±122[10] K
Metallicity [Fe/H]+0.01[11] dex
Rotational velocity (v sin i)<1[12] km/s
Other designations
CD−30°1968, CPD−31°593, GC 5762, HD 30080, HIP 21958, HR 1509, SAO 195250[13]
Database references
SIMBADdata

HD 30080, also known as HR 1509, is a solitary,[14] orange hued star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 5.66,[2] allowing it to be faintly visible to the naked eye. Parallax measurements from Gaia DR3 place the object at a distance of 612 light years. It appears to be approaching the Solar System with a heliocentric radial velocity of −3.8 km/s.[5] Eggen (1989) lists it as a member of the thick disk population.[11]

HD 30080 is an evolved red giant with a stellar classification of K3 III.[3] It is currently on the red giant branch,[1] generating energy by fusing a hydrogen shell around an inert helium core. It has 116% the mass of the Sun[7] but has expanded to 41.6 times its girth.[8] It radiates 299 times the luminosity of the Sun[9] from its enlarged photosphere at an effective temperature of 4,262 K.[10] HD 30080 has a solar metallicity[11] and spins slowly with a projected rotational velocity of <1 km/s.[12]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (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. ↑ 3.0 3.1 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations −40° to −26°. Bibcode: 1982mcts.book.....H. 
  4. ↑ 4.0 4.1 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. 
  5. ↑ 5.0 5.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 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. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  8. ↑ 8.0 8.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  9. ↑ 9.0 9.1 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.
  10. ↑ 10.0 10.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  11. ↑ 11.0 11.1 11.2 Eggen, Olin J. (April 1989). "Large and kinematically unbiased samples of G- and K-type stars. IV - Evolved stars of the old disk population". Publications of the Astronomical Society of the Pacific 101: 366. doi:10.1086/132442. ISSN 0004-6280. Bibcode: 1989PASP..101..366E. 
  12. ↑ 12.0 12.1 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". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  13. ↑ "HD 30080". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+30080. 
  14. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
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