NW Puppis

NW Puppis

A light curve for NW Puppis, plotted from TESS data,[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 07h 18m 38.18632s[2]
Declination −36° 44′ 33.8557″[2]
Apparent magnitude (V) 5.11[3]
Characteristics
Spectral type B3 Vne
Variable type β Cep[3]
Astrometry
Radial velocity (Rv)+18.00±10[4] km/s
Proper motion (μ) RA: −10.848[2] mas/yr
Dec.: +6.699[2] mas/yr
Parallax (π)3.5875 ± 0.1683 mas[2]
Distance910 ± 40 ly
(280 ± 10 pc)
Details
Luminosity1,108[5] L☉
Surface gravity (log g)4.07±0.57[6] cgs
Temperature17,930±540[6] K
Rotational velocity (v sin i)80±8[6] km/s
Other designations
υ2 Pup, NW Pup, CD−36°3519, HD 57219, HIP 35406, HR 2790, SAO 197837
Database references
SIMBADdata

NW Puppis, also known as υ2 Puppis, is a star in the constellation Puppis. Located around 910 light-years distant, it shines with a luminosity approximately 1,108 times that of the Sun and has a surface temperature of 15,000 K.[5]

The star's variability was first detected in 1970 (based on observations made at La Silla Observatory), and announced by Armand van Hoof in 1973.[7] It was given its variable star designation in 1977.[8] Anamarija Stankov ruled this star out as a Beta Cephei variable,[9] but the GCVS and the International Variable Star Index classify it as both a Beta Cephei variable and a rotating ellipsoidal variable.[10][11] The GCVS lists its period as 0.125 days, but the TESS data shows lower frequency and stochastic brightness variations.[10][12]

Neither component of this double is given a letter in Lacaille's catalogue or the British Association star catalogue.[13][14] Gould gave them the designations (Latin letter) v1 and v2 Puppis, but these are rarely used.[15] Lacaille applied the Greek letter υ to the star now called υ Carinae.[13] The designation υ2 first appeared in several catalogues at the end of the 19th century.[16]

  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 27 September 2024.
  2. ^ a b c d e 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.
  3. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  4. ^ Kharchenko, N. V.; Scholz, R.-D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
  5. ^ a b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
  6. ^ a b c Zorec, J.; et al. (November 2016). "Critical study of the distribution of rotational velocities of Be stars. I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity". Astronomy & Astrophysics. 595: 26. Bibcode:2016A&A...595A.132Z. doi:10.1051/0004-6361/201628760. hdl:11336/37946.
  7. ^ van Hoof, A. (June 1973). "Six New Variable B-Stars" (PDF). Information Bulletin on Variable Stars. 807: 1. Bibcode:1973IBVS..807....1V. Retrieved 11 October 2024.
  8. ^ Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (March 1977). "62nd Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 1248: 1. Bibcode:1977IBVS.1248....1K. Retrieved 11 October 2024.
  9. ^ Stankov, Anamarija; Handler, Gerald (2005). "Catalog of Galactic β Cephei Stars". The Astrophysical Journal Supplement Series. 158 (2): 193–216. arXiv:astro-ph/0506495. Bibcode:2005ApJS..158..193S. doi:10.1086/429408. ISSN 0067-0049. S2CID 119526948.
  10. ^ a b "Query= NW Pup". General Catalog of Variable Stars. Lomonosov Moscow State University. Retrieved 10 October 2024.
  11. ^ "NW Pup". International Variable Star Index. American Association of Variable Star Observers. Retrieved 10 October 2024.
  12. ^ Labadie-Bartz, Jonathan; Carciofi, Alex C.; Henrique de Amorim, Tajan; Rubio, Amanda; Luiz Figueiredo, André; Ticiani dos Santos, Pedro; Thomson-Paressant, Keegan (May 2022). "Classifying Be Star Variability With TESS. I. The Southern Ecliptic". The Astronomical Journal. 163 (5): 226. arXiv:2010.13905. Bibcode:2022AJ....163..226L. doi:10.3847/1538-3881/ac5abd.
  13. ^ a b Coelum australe stelliferum ... H L Guerin & L F Delatour. 1763. pp. 7–.
  14. ^ Baily, Francis (1845). "The Catalogue of Stars of the British Association for the Advancement of Science". The Catalogue of Stars of the British Association for the Advancement of Science; Containing the Mean Right Ascensions and North Polar Distances of Eight Thousand Three Hundred and Seventy-Seven Fixed Stars. Bibcode:1845tcot.book.....B.
  15. ^ Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002). 4027. Bibcode:2004yCat.4027....0K.
  16. ^ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.