Chi Puppis

χ Puppis, Latinised as Chi Puppis, is a single[11] star in the southern constellation of Puppis. It has a white hue and is faintly visible to the eye at night with an apparent visual magnitude of 4.79.[2] The star is located at a distance of approximately 1,800 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +30 km/s.[7] O. J. Eggen listed this star as a member of the Hyades Stream based on its space motion.[12]

χ Puppis
Location of χ Puppis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 07h 57m 40.10678s[1]
Declination −30° 20′ 04.4491″[1]
Apparent magnitude (V) 4.79[2]
Characteristics
Spectral type A5 II[3] or A7 III[4] or A2 Vv[5]
U−B color index +0.16[2]
B−V color index +0.151±0.012[6]
Astrometry
Radial velocity (Rv)+30.0±0.5[7] km/s
Proper motion (μ) RA: −8.643[1] mas/yr
Dec.: +6.055[1] mas/yr
Parallax (π)1.7957 ± 0.1890 mas[1]
Distanceapprox. 1,800 ly
(approx. 560 pc)
Absolute magnitude (MV)−3.07[6]
Details
Radius30.39+1.53
−1.70[1] R☉
Luminosity3,116±374[1] L☉
Surface gravity (log g)2.17[8] cgs
Temperature7,823+229
−190[1] K
Rotational velocity (v sin i)39.2±0.3[9] km/s
Other designations
chi Pup, NSV 3830, CD−29°5236, FK5 1210, GC 10774, HD 65456, HIP 38901, HR 3113, SAO 198636, GSC 07120-02422[10]
Database references
SIMBADdata

There has been some disagreement as to the stellar classification of Chi Puppis. In 1962, W. Buscombe classified it as A2Vvar,[13] matching a variable A-type main-sequence star. However, P. S. Conti in 1965 considered that to be a misclassification on the basis of its B-V color index. He considers it of later type A5.[14] In their study of the nearby open cluster NGC 2483, M. P. Fitzgerald and A. F. J. Moffat used the same class, A2Vv.[5] In 1979, Nancy Houk assigned it to class A7 III,[4] indicating it may be an A-type giant star. Finally, R. O. Gray and associates found a class of A5 II,[3] matching a bright giant.

In his star atlas Neue Uranometrie, Friedrich Wilhelm Argelander labelled this star as χ Argo. It was probably labelled as χ by Bayer in the original Uranometria, although Bayer's chart is somewhat fanciful. Nicolas-Louis de Lacaille changed Bayer's designations in Argo Navis and applied χ to the star now called χ Carinae.[15]

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. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. Gray, R. O.; et al. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148. Bibcode:2001AJ....121.2148G. doi:10.1086/319956.
  4. Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
  5. Fitzgerald, M. P.; Moffat, A. F. J. (April 1975). "On the nature of the Puppis cluster NGC 2483". Astronomy and Astrophysics, Supplemental Series. 20: 289–304. Bibcode:1975A&AS...20..289F.
  6. 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. S2CID 119257644.
  7. Gontcharov, G. A. (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. S2CID 119231169.
  8. Gray, R. O.; Graham, P. W.; Hoyt, S. R. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. II. Basic Parameters of Program Stars and the Role of Microturbulence". The Astronomical Journal. 121 (4): 2159. Bibcode:2001AJ....121.2159G. doi:10.1086/319957.
  9. Díaz, C. G.; et al. (July 2011). "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum". Astronomy & Astrophysics. 531: A143. arXiv:1012.4858. Bibcode:2011A&A...531A.143D. doi:10.1051/0004-6361/201016386. S2CID 119286673.
  10. "chi Pup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-12.
  11. Eggleton, P. P.; Tokovinin, A. A. (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. S2CID 14878976.
  12. Eggen, Olin J. (1996). "The Stellar Content of Star Stream I". Astronomical Journal. 111: 1615. Bibcode:1996AJ....111.1615E. doi:10.1086/117901.
  13. Buscombe, W. (1962). "Spectral classification of Southern fundamental stars". Mount Stromlo Obs. Mimeo. 4: 1. Bibcode:1962MtSOM...4....1B.
  14. Conti, Peter S. (November 1965). "The Early a Stars. I. Rotation and Metallicism". Astrophysical Journal. 142: 1594. Bibcode:1965ApJ...142.1594C. doi:10.1086/148439.
  15. Hoffleit, D.; Warren, W. H. (1995). "Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H (5th Revised ed.). 5050. Bibcode:1995yCat.5050....0H.
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