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HD 3322

From Wikipedia, the free encyclopedia
(Redirected fromPY Andromedae)
Binary star in the constellation Andromeda
HD 3322

Ultraviolet, blue andvisual bandlight curves for PY Andromedae, plotted from data published by Catalano and Leone (1991)[1]
Observation data
Epoch J2000      Equinox J2000
ConstellationAndromeda
Right ascension00h 36m 20.09863s[2]
Declination+27° 15′ 17.1519″[2]
Apparent magnitude (V)6.51[3]
Characteristics
Evolutionary stageMain sequence[4]
Spectral typeB8.5 IIIp HgMn[5]
B−Vcolor index−0.070±0.011[3]
Variable typeα2 CVn[6]
Astrometry
Radial velocity (Rv)+4.0±7.4[7] km/s
Proper motion (μ)RA: +15.96[2]mas/yr
Dec.: −11.11[2]mas/yr
Parallax (π)4.59±0.65 mas[2]
Distanceapprox. 700 ly
(approx. 220 pc)
Absolute magnitude (MV)−0.13[3]
Orbit[8]
Period (P)399.6±2.1 d
Eccentricity (e)0.57±0.09
Periastronepoch (T)2440462.38 ± 6.05 JD
Argument of periastron (ω)
(secondary)		304±11°
Semi-amplitude (K1)
(primary)		8.07±1.07 km/s
Details
HD 3322 A
Mass3.68±0.21[4] M☉
Radius4.8[9] R☉
Luminosity246+91
−66[4] L☉
Surface gravity (log g)3.821±0.056[10] cgs
Temperature12,882+90
−88[4] K
Rotational velocity (v sin i)14[4] km/s
Other designations
PY And,BD+26° 91,HD 3322,HIP 2865,HR 149,SAO 74136,PPM 89965[11]
Database references
SIMBADdata

HD 3322 is abinary star[8] system in the northernconstellation ofAndromeda. With anapparent visual magnitude of 6.51,[3] it lies below the nominal brightness limit for visibility with the normal naked eye, but it is still possible to see the star with excellent vision under ideal seeing conditions. An annualparallax shift of4.59±0.65 mas[2] provides a distance estimate of roughly 700 light years.

This is a single-linedspectroscopic binary star system with anorbital period of around 400 days and aneccentricity of 0.57.[8] The visible component has astellar classification ofB8.5 IIIp HgMn,[5] matching achemically peculiarB-typegiantmercury-manganese star.[12] Catalano and Leone (1991) found it to be aα2 CVn variable with a period of 4.6904 days,[1] and thus it received thevariable star designation PY And.[6] It has an estimated 3.7[4] times themass of the Sun and about 4.8[9] times theSun's radius. It is radiating around 246[4] times theSun's luminosity from itsphotosphere at aneffective temperature of 12,882 K.[4]

References

[edit]
  1. ^abCatalano, F. A.; Leone, F. (April 1991), "Photoelectric photometry of chemically peculiar stars at the Catania Astrophysical Observatory. II - Observations of the CP3 stars HD 3322, HD 27295 and HD 89822",Astronomy and Astrophysics,244 (2):327–334,Bibcode:1991A&A...244..327C.
  2. ^abcdefvan Leeuwen, F. (2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics,474 (2):653–664,arXiv:0708.1752,Bibcode:2007A&A...474..653V,doi:10.1051/0004-6361:20078357,S2CID 18759600.
  3. ^abcdAnderson, 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.
  4. ^abcdefghZorec, J.; Royer, F. (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,S2CID 55586789.
  5. ^abAbt, Helmut A.; Morrell, Nidia I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars",Astrophysical Journal Supplement,99: 135,Bibcode:1995ApJS...99..135A,doi:10.1086/192182.
  6. ^abKazarovets, E. V.; et al. (February 1993), "The 71st Name-List of Variable Stars",Information Bulletin on Variable Stars,3840: 1,Bibcode:1993IBVS.3840....1K.
  7. ^de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project",Astronomy & Astrophysics,546: 14,arXiv:1208.3048,Bibcode:2012A&A...546A..61D,doi:10.1051/0004-6361/201219219,S2CID 59451347, A61.
  8. ^abcStickland, D. J.; Weatherby, J. (1984), "Radial velocities of northern Mercury stars",Astronomy and Astrophysics Supplement Series,57:55–67,Bibcode:1984A&AS...57...55S.
  9. ^ab"HIP 2865",Wolfram Alpha, retrieved2013-08-09
  10. ^Huang, Wenjin; et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS",The Astrophysical Journal,722 (1):605–619,arXiv:1008.1761,Bibcode:2010ApJ...722..605H,doi:10.1088/0004-637X/722/1/605,S2CID 118532653.
  11. ^"V* PY And".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2018-05-01.
  12. ^Renson, P.; Manfroid, J. (May 2009),"Catalogue of Ap, HgMn and Am stars",Astronomy and Astrophysics,498 (3):961–966,Bibcode:2009A&A...498..961R,doi:10.1051/0004-6361/200810788.
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