HD 31134

Last updated
HD 31134
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 31134 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Camelopardalis [1]
Right ascension 04h 56m 07.07238s [2]
Declination +52° 52′ 11.0544″ [2]
Apparent magnitude  (V)5.74±0.01 [3]
Characteristics
Evolutionary stage main sequence [4]
Spectral type A2 Vs [5] or A1 Vp [6]
U−B color index +0.11 [3]
B−V color index +0.09 [3]
Astrometry
Radial velocity (Rv)−15.1±2.5 [7] km/s
Proper motion (μ)RA: −3.418 mas/yr [2]
Dec.: +14.954 mas/yr [2]
Parallax (π)6.8897±0.1144  mas [2]
Distance 473 ± 8  ly
(145 ± 2  pc)
Absolute magnitude  (MV)+0.19 [1]
Details
Mass 2.74±0.05 [4]   M☉
Radius 4.38±0.22 [8]   R☉
Luminosity 103+13
−11 [4]   L☉
Surface gravity (log g)3.85 [9]   cgs
Temperature 8,690 [9]   K
Metallicity [Fe/H]−0.11 [10]   dex
Rotational velocity (v sin i)60±1 [11]  km/s
Age 432 [12]   Myr
Other designations
AG+52°472, BD+52°898, GC 5988, HD 31134, HIP 22936, HR 1561, SAO 24919 [13]
Database references
SIMBAD data

HD 31134, also designated as HR 1561, is a solitary star [14] located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a white-hued star with an apparent magnitude of 5.74. [3] Gaia DR3 parallax measurements place it 473 light years away. [2] It appears to be approaching the Solar System with a heliocentric radial velocity of −15.1  km/s . [7] At its current distance, HD 31134's brightness is diminished by 0.35 magnitudes due to interstellar dust. [15] It has an absolute magnitude of +0.19. [1]

The object has a stellar classification of A2 Vs, [5] indicating that it is an A-type main-sequence star with sharp or narrow absorption lines due to slow rotation. Two sources remove the s prefix and instead list it as an ordinary dwarf star [16] [17] while one lists it as a more evolved giant star. [18] Abt and Morell (1995) list it as a slightly hotter peculiar Ap star, [6] but it is now considered unlikely to be chemically peculiar. [19] It has 2.74 times the mass of the Sun and an enlarged radius of 4.38  R☉. [8] It radiates 103 times the luminosity of the Sun [4] from its photosphere at an effective temperature of 8,690  K . [9] HD 31134 is a rather evolved star, having completed 97.6% of its main sequence lifetime [4] at the age of 432 million years. [12] Consistent with its spectrum, it spins modestly with a projected rotational velocity of 60  km/s . [11]

References

  1. 1 2 3 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. 1 2 3 4 5 6 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. 1 2 3 4 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89: 415. Bibcode:1991A&AS...89..415O. ISSN   0365-0138.
  4. 1 2 3 4 5 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691 . eISSN   1432-0746. ISSN   0004-6361. S2CID   55586789.
  5. 1 2 Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode:1969AJ.....74..375C. doi: 10.1086/110819 . ISSN   0004-6256.
  6. 1 2 Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi: 10.1086/192182 . ISSN   0067-0049.
  7. 1 2 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. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  8. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361.
  9. 1 2 3 Philip, A. G. D.; Egret, D. (May 1980). "An analysis of the Hauck-Mermillod catalogue of homogeneous four-color data. II". Astronomy and Astrophysics Supplement Series. 40: 199–205. Bibcode:1980A&AS...40..199P. ISSN   0365-0138.
  10. ↑ 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 . eISSN   1432-0746. ISSN   0004-6361.
  11. 1 2 Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (October 2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy & Astrophysics. 393 (3): 897–911. arXiv: astro-ph/0205255 . Bibcode:2002A&A...393..897R. doi: 10.1051/0004-6361:20020943 . eISSN   1432-0746. ISSN   0004-6361.
  12. 1 2 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814 . Bibcode:2012AstL...38..771G. doi: 10.1134/S1063773712120031 . eISSN   1562-6873. ISSN   1063-7737.
  13. ↑ "HR 1561". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved January 3, 2023.
  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. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x . eISSN   1365-2966. ISSN   0035-8711. S2CID   14878976.
  15. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711.
  16. ↑ Appenzeller, Immo (April 1967). "MK Spectral Types for 185 Bright Stars". Publications of the Astronomical Society of the Pacific. 79 (467): 102. Bibcode:1967PASP...79..102A. doi: 10.1086/128449 . eISSN   1538-3873. ISSN   0004-6280.
  17. ↑ Cucchiaro, A.; Macau-Hercot, D.; Jaschek, M.; Jaschek, C. (July 1978). "Spectral classification from the ultraviolet line features of S2/68 spectra. III. Early A-type stars". Astronomy and Astrophysics Supplement Series. 33: 15–26. Bibcode:1978A&AS...33...15C. ISSN   0365-0138.
  18. ↑ Palmer, D. R.; Walker, E. N.; Jones, D. H. P.; Wallis, R. E. (1968). "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars". Royal Greenwich Observatory Bulletins. 135: 385. Bibcode:1968RGOB..135..385P.
  19. ↑ Renson, P.; Manfroid, J. (19 March 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy & Astrophysics. 498 (3): 961–966. Bibcode:2009A&A...498..961R. doi: 10.1051/0004-6361/200810788 . eISSN   1432-0746. ISSN   0004-6361.
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