Astronomy:NW Puppis

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Short description: B-type star in the constellation Puppis
NW Puppis
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A light curve for NW Puppis, plotted from TESS data,[1]
Observation data
Equinox J2000.0]] (ICRS)
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[4]
Variable type β Cep[3]
Astrometry
Radial velocity (Rv)+18.00±10[5] km/s
Proper motion (μ) RA: −10.848[2] mas/yr
Dec.: +6.699[2] mas/yr
Parallax (π)3.5875 ± 0.1683[2] mas
Distance910 ± 40 ly
(280 ± 10 pc)
Details
Mass6.5[6] M☉
Radius5.6[6] R☉
Luminosity1,995[6] L☉
Surface gravity (log g)4.07±0.57[7] cgs
Temperature17,930±540[7] K
Rotation1.42 days[8]
Rotational velocity (v sin i)80±8[7] km/s
Age40[6] Myr
Other designations
υ2 Pup, NW Pup, CD−36°3519, HD 57219, HIP 35406, HR 2790, SAO 197837, NW Puppis, υ2 Puppis, Upsilon2 Puppis, Upsilon2 Pup
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 2,000 times that of the Sun and has a surface temperature of 17,930 K.

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.[9] It was given its variable star designation in 1977.[10] Anamarija Stankov ruled this star out as a Beta Cephei variable,[11] but the GCVS and the International Variable Star Index classify it as both a Beta Cephei variable and a rotating ellipsoidal variable.[12][13] The GCVS lists its period as 0.125 days, but the TESS data shows lower frequency and stochastic brightness variations.[12][14]

Neither component of this double is given a letter in Lacaille's catalogue or the British Association star catalogue.[15][16] Gould gave them the designations (Latin letter) v1 and v2 Puppis, but these are rarely used.[17] Lacaille applied the Greek letter υ to the star now called υ Carinae.[15] The designation υ2 first appeared in several catalogues at the end of the 19th century.[18]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 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.
  3. ↑ 3.0 3.1 Samus, N. N. 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. ↑ Buscombe, William (1969). "Line strengths for southern OB stars-II. Observations with moderate dispersion". Monthly Notices of the Royal Astronomical Society 144: 31. doi:10.1093/mnras/144.1.31. Bibcode: 1969MNRAS.144...31B. 
  5. ↑ 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. doi:10.1002/asna.200710776. Bibcode: 2007AN....328..889K. 
  6. ↑ 6.0 6.1 6.2 6.3 Glagolevskij, Yu. V. (2019). "On Properties of Main Sequence Magnetic Stars". Astrophysical Bulletin 74 (1): 66. doi:10.1134/S1990341319010073. Bibcode: 2019AstBu..74...66G. 
  7. ↑ 7.0 7.1 7.2 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. doi:10.1051/0004-6361/201628760. Bibcode: 2016A&A...595A.132Z. 
  8. ↑ Balona, Luis A.; Ozuyar, Dogus (2021). "TESS Observations of be Stars: General Characteristics and the Impulsive Magnetic Rotator Model". The Astrophysical Journal 921 (1): 5. doi:10.3847/1538-4357/ac1a77. Bibcode: 2021ApJ...921....5B. 
  9. ↑ van Hoof, A. (June 1973). "Six New Variable B-Stars". Information Bulletin on Variable Stars 807: 1. Bibcode: 1973IBVS..807....1V. https://ibvs.konkoly.hu/pub/ibvs/0801/0807.pdf. Retrieved 11 October 2024. 
  10. ↑ 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". Information Bulletin on Variable Stars 1248: 1. Bibcode: 1977IBVS.1248....1K. https://ibvs.konkoly.hu/pub/ibvs/1201/1248.pdf. Retrieved 11 October 2024. 
  11. ↑ Stankov, Anamarija; Handler, Gerald (2005). "Catalog of Galactic β Cephei Stars". The Astrophysical Journal Supplement Series 158 (2): 193–216. doi:10.1086/429408. ISSN 0067-0049. Bibcode: 2005ApJS..158..193S. 
  12. ↑ 12.0 12.1 "Query= NW Pup". Lomonosov Moscow State University. http://www.sai.msu.su/gcvs/cgi-bin/search2.cgi?search=NW+Pup. 
  13. ↑ "NW Pup". American Association of Variable Star Observers. https://www.aavso.org/vsx/index.php?view=detail.top&oid=26900. 
  14. ↑ 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. doi:10.3847/1538-3881/ac5abd. Bibcode: 2022AJ....163..226L. 
  15. ↑ 15.0 15.1 Coelum australe stelliferum .... H L Guerin & L F Delatour. 1763. pp. 7–. https://books.google.com/books?id=LIo_AAAAcAAJ&pg=PP7. 
  16. ↑ 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. 
  17. ↑ 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. 
  18. ↑ 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. 



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