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HD 3322

Ultraviolet, blue and visual band light curves for PY Andromedae, plotted from data published by Catalano and Leone (1991)
Observation data Epoch J2000      Equinox J2000
Constellation	Andromeda
Right ascension	00 36 20.09863
Declination	+27° 15′ 17.1519″
Apparent magnitude (V)	6.51
Characteristics
Evolutionary stage	Main sequence
Spectral type	B8.5 IIIp HgMn
B−V color index	−0.070±0.011
Variable type	α CVn
Astrometry
Radial velocity (Rv)	+4.0±7.4 km/s
Proper motion (μ)	RA: +15.96 mas/yr Dec.: −11.11 mas/yr
Parallax (π)	4.59 ± 0.65 mas
Distance	approx. 700 ly (approx. 220 pc)
Absolute magnitude (MV)	−0.13
Orbit
Period (P)	399.6±2.1 d
Eccentricity (e)	0.57±0.09
Periastron epoch (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
Mass	3.68±0.21 M☉
Radius	4.8 R☉
Luminosity	246+91 −66 L☉
Surface gravity (log g)	3.821±0.056 cgs
Temperature	12,882+90 −88 K
Rotational velocity (v sin i)	14 km/s
Other designations
PY And, BD+26° 91, HD 3322, HIP 2865, HR 149, SAO 74136, PPM 89965
Database references
SIMBAD	data

HD 3322 is a binary star system in the northern constellation of Andromeda. With an apparent visual magnitude of 6.51, 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 annual parallax shift of 4.59±0.65 mas provides a distance estimate of roughly 700 light years.

This is a single-lined spectroscopic binary star system with an orbital period of around 400 days and an eccentricity of 0.57. The visible component has a stellar classification of B8.5 IIIp HgMn, matching a chemically peculiar B-type giant mercury-manganese star. Catalano and Leone (1991) found it to be a α CVn variable with a period of 4.6904 days, and thus it received the variable star designation PY And. It has an estimated 3.7 times the mass of the Sun and about 4.8 times the Sun's radius. It is radiating around 246 times the Sun's luminosity from its photosphere at an effective temperature of 12,882 K.

References

1. ^ Catalano, 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. ^ van 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. ^ 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.
4. ^ Zorec, 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. ^ Abt, 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. ^ Kazarovets, 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. ^ Stickland, 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. ^ "HIP 2865", Wolfram Alpha, retrieved 2013-08-09
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. Retrieved 2018-05-01.
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.

v t e Constellation of Andromeda
Adhil Andromeda in Chinese astronomy List of Andromeda's satellite galaxies List of stars in Andromeda
Stars	Bayer α (Alpheratz) β (Mirach) γ (Almach) δ ε ζ η θ ι κ λ μ ν ξ (Adhil) ο π ρ σ τ υ (Titawin) φ χ ψ ω A b c υ Per (Nembus) Flamsteed 2 3 4 5 6 7 8 9 10 11 12 13 14 (Veritate) 15 18 22 23 26 28 32 36 39 41 44 45 47 55 56 58 59 63 64 65 66 6 Per Variable R T U W Z RT RV RX SU SW TU TW WZ XZ AB AC AD AE AF AR BM BX CC CG CN DS DX EG ET EU FF GO GP GQ GX GR GY HH HN IW KK KX KZ LL LN LP LQ OP OS OU PX PY QR QV QX V385 V428 V439 V455 V529 V807 HR 1 40 56 78 104 122 134 178 275 282 283 289 379 410 483 687 746 748 8884 8925 8950 8962 8973 9011 9074 9075 9105 HD 16175 (Buna) 222155 Other 3XMM J004232.1+411314 ADS 48 HAT-P-6 (Sterrennacht) HAT-P-16 HAT-P-19 HAT-P-28 M31-RV KELT-1 NGC 44 NGC 82 NGC 84 NGC 91 NGC 162 NGC 464 Qatar-3 Qatar-4 Qatar-5 PA-99-N2 WASP-1 WISE 0146+4234 WISE J0005+3737 WISE J004945.61+215120.0
Exoplanets 14 Andromedae b κ Andromedae b υ Andromedae b c d Gliese 15 Ab c HD 13931 b HD 16175 b HAT-P-6b HAT-P-32b WASP-1b WASP-33b Qatar-4b Qatar-5b
Star clusters	NGC 206 272 752 956 7686 Other Mayall II RBC EXT8
Nebulae	NGC 7662
Galaxies	Messier 32 110 NGC 5 11 13 19 20 21 27 39 43 48 49 51 67 68 69 70 71 72 74 76 79 80 81 83 85 86 90 93 94 96 97 108 109 112 140 149 160 169 181 183 184 214 218 226 228 229 233 243 252 258 260 262 280 304 317 389 393 404 425 431 477 512 513 523 528 529 531 536 542 561 605 620 668 679 687 700 703 704 705 708 709 710 712 714 717 721 732 753 759 801 812 834 891 906 910 911 912 913 920 937 980 995 996 999 1000 7640 7836 Numbered I II III IV V VIII IX X XI XVIII XIX XXI Other 3C 66A 3C 66B Andromeda Galaxy Arp 273 Donatiello I UGC 1840
Galaxy clusters Abell 262 NGC 68 group
Astronomical events GRB 101225A SN 1885A (S)
Category

• B-type giants
• Alpha2 Canum Venaticorum variables
• Spectroscopic binaries
• Andromeda (constellation)
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects
• Objects with variable star designations