Astronomy:Chi Puppis

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Short description: Star in the constellation Puppis
χ Puppis
Puppis constellation map.svg
Red circle.svg
Location of χ Puppis (circled)
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
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

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]

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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 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.
  2. ↑ 2.0 2.1 2.2 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. ↑ 3.0 3.1 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. doi:10.1086/319956. Bibcode: 2001AJ....121.2148G. 
  4. ↑ 4.0 4.1 Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode: 1982mcts.book.....H. 
  5. ↑ 5.0 5.1 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. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 Gontcharov, G. A. (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. Bibcode: 2006AstL...32..759G. 
  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. doi:10.1086/319957. Bibcode: 2001AJ....121.2159G. 
  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. doi:10.1051/0004-6361/201016386. Bibcode: 2011A&A...531A.143D. 
  10. ↑ "chi Pup". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=chi+Pup. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  12. ↑ Eggen, Olin J. (1996). "The Stellar Content of Star Stream I". Astronomical Journal 111: 1615. doi:10.1086/117901. Bibcode: 1996AJ....111.1615E. 
  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. doi:10.1086/148439. Bibcode: 1965ApJ...142.1594C. 
  15. ↑ Hoffleit, D.; Warren, W. H. (1995). "Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050. Bibcode: 1995yCat.5050....0H. 

External links



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