Astronomy:V424 Lacertae

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Short description: Star in the constellation Lacerta
V424 Lacertae
Location of V424 Lacertae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Lacerta
Right ascension  22h 56m 25.99839s[1]
Declination +49° 44′ 00.7587″[1]
Apparent magnitude (V) +4.94[2]
Characteristics
Spectral type K5 Ib[3]
U−B color index +1.95[2]
B−V color index +1.77[2]
Variable type Lc[4]
Astrometry
Radial velocity (Rv)−9.50[5] km/s
Proper motion (μ) RA: −0.649[1] mas/yr
Dec.: −2.768[1] mas/yr
Parallax (π)1.4018 ± 0.1129[1] mas
Distance2,300 ± 200 ly
(710 ± 60 pc)
Details
Mass6.8[6] M☉
Radius288+26
−21[7] R☉
Luminosity16,600+4,300
−3,400[8] L☉
Surface gravity (log g)+0.50[6] cgs
Temperature3749±49[8] K
Other designations
Tengshe, V424 Lac, BD+48°3887, HR 8726, HD 216946, BD+48°3887, HIP 113288, SAO 52516
Database references
SIMBADdata

V424 Lacertae (V424 Lac), also named Tengshe,[9] is a red supergiant and a variable star in the constellation Lacerta. It is a member of the Lacerta OB1 stellar association.

An ultraviolet band light curve light curve for V424 Lacertae, adapted from Messina (2007)[10]

The MK spectral type of V424 Lac has been determined to be K5,[3] but it has also been classified as M0.[11] It was discovered to be slightly variable using analysis of Hipparcos photometry. The total range is less than a tenth of a magnitude.[12] Multiple short periods are detected, as well as slow variations with a period of 1,100 or 1,601 days. Although listed in the General Catalogue of Variable Stars as a slow irregular variable, it has been considered to be either a semiregular variable or long secondary period variable.[10]

There is an ultraviolet excess from V424 Lacertae, that may be due to an unseen companion, which could also explain the long secondary period. On this assumption, a low-mass stellar companion in a 1,382 day 6.2 AU orbit has been suggested.[6]

This star was part of the ancient Chinese constellation Tengshe (螣蛇, Flying Serpent), dating back to the 2nd century BCE. The IAU Working Group on Star Names approved the name Tengshe for this star on 19 September 2024 and it is now so entered in the IAU Catalog of Star Names.[9]

References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 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: 0. Bibcode: 2002yCat.2237....0D. 
  3. ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K. 
  4. ↑ 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. 
  5. ↑ 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. 
  6. ↑ 6.0 6.1 6.2 Lee, B.-C.; Han, I.; Park, M.-G.; Hatzes, A. P.; Kim, K.-M. (2014). "Low-amplitude and long-period radial velocity variations in giants HD 3574, 63 Cygni, and HD 216946". Astronomy & Astrophysics 566: A124. doi:10.1051/0004-6361/201321863. Bibcode: 2014A&A...566A.124L. 
  7. ↑ Ryan Norris. "Student Science at NMT: Learning Optical Interferometry Through Projects on Evolved Stars". CHARA. https://www.chara.gsu.edu/files/2023Meeting/Norris_NMT_Students_2023.pdf. 
  8. ↑ 8.0 8.1 Taniguchi, Daisuke; Matsunaga, Noriyuki; Jian, Mingjie; Kobayashi, Naoto; Fukue, Kei; Hamano, Satoshi; Ikeda, Yuji; Kawakita, Hideyo et al. (2022-05-01). "Erratum: Effective temperatures of red supergiants estimated from line-depth ratios of iron lines in the YJ bands, 0.97-1.32 μm". Monthly Notices of the Royal Astronomical Society 512 (2): 2669–2670. doi:10.1093/mnras/stac686. ISSN 0035-8711. Bibcode: 2022MNRAS.512.2669T. 
  9. ↑ 9.0 9.1 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 
  10. ↑ 10.0 10.1 Messina, Sergio (2007). "Evidence for the pulsational origin of the Long Secondary Periods: The red supergiant star V424 Lac (HD 216946)". New Astronomy 12 (7): 556–561. doi:10.1016/j.newast.2007.04.002. Bibcode: 2007NewA...12..556M. 
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named levesque
  12. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars 4659: 1. Bibcode: 1999IBVS.4659....1K. 



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