Astronomy:Merope (star)

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Short description: B-type subgiant star in the constellation Taurus
Merope
Image of the Pleiades star cluster
Red circle.svg
Merope in the Pleiades cluster (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Taurus
Right ascension  03h 46m 19.5859s[1]
Declination 23° 56′ 54.092″[1]
Apparent magnitude (V) 4.18[2]
Characteristics
Spectral type B6IV(e)[3]
U−B color index −0.41[4]
B−V color index −0.06[4]
Variable type β Cephei[5]
Astrometry
Radial velocity (Rv)6.2[6] km/s
Proper motion (μ) RA: 13.075[1] mas/yr
Dec.: −48.404[1] mas/yr
Parallax (π)7.0670 ± 0.2862[1] mas
Distance460 ± 20 ly
(142 ± 6 pc)
Absolute magnitude (MV)−1.29[7]
Details
Mass4.25[8] M☉
Radius7.7[9] R☉
Luminosity927[10] L☉
Surface gravity (log g)3.48[10] cgs
Temperature14,550[10] K
Rotational velocity (v sin i)240[10] km/s
Age212[11] Myr
Other designations
Merope, 23 Tau, V971 Tauri, HR 1156, BD+23°522, HD 23480, HIP 17608, SAO 76172, GC 4512, CCDM J03463+2357A
Database references
SIMBADdata

Merope /ˈmɛrəpiː/,[12] designated 23 Tauri (abbreviated 23 Tau), is a star in the constellation of Taurus and a member of the Pleiades star cluster. It is approximately 440 light-years (135 pc) away.

Distance

Despite being one of the closest star clusters to Earth, the distance to the Pleiades and its member stars is still in dispute. The parallax of Merope itself is not known precisely enough to give an accurate distance. Its Hipparcos parallax has a statistical margin of error of about 5% and gave a distance 116 parsecs. This, and an overall distance to the Pleiades calculated from Hipparcos parallaxes of 120 parsecs, are inconsistent with other parallax measurements such as from Gaia. Merope is too bright for Gaia to have a reliable parallax for it, but calculations of the overall distance to the Pleiades cluster using Hipparcos, Gaia, Hubble Space Telescope, and other methods repeatedly show that the Hipparcos parallaxes suffered from some kind of systemic error, and the distance to the Pleiades is most likely around 135 parsecs.[13][14][15][16][17]

Description

A light curve for V971 Tauri (Merope), adapted from White et al. (2017)[18]

Merope is a blue-white B-type subgiant with a mean apparent magnitude of +4.18. Richard Hinckley Allen described the star as lucid white and violet.[19] It has a luminosity of 927 times that of the Sun and a surface temperature of 14,550 K. Merope's mass is roughly 4.25 M☉ and has a radius more than 7 times as great as the Sun's. It is classified as a Beta Cephei type variable star and its brightness varies by 0.01 magnitudes.[5] It is given the variable star designation of V971 Tauri.

Some papers have reported a companion star to Merope, at a separation of 250 mas, as well as several other visual companions farther out. These possible companions have not been confirmed.[20]

Surrounding Merope is the Merope Nebula (NGC 1435). It appears brightest around Merope and is listed in the Index Catalogue as number IC 349.

Nomenclature

23 Tauri is the star's Flamsteed designation. The name Merope originates with Greek mythology; she is one of the seven daughters of Atlas and Pleione known as the Pleiades. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[21] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[22] included a table of the first two batches of names approved by the WGSN; which included Merope for this star. It is now so entered in the IAU Catalog of Star Names.[23]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  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. Bibcode: 2002yCat.2237....0D. 
  3. ↑ Slettebak, A (1982). "Spectral types and rotational velocities of the brighter Be stars and A-F type shell stars". Astrophysical Journal Supplement Series 50: 55. doi:10.1086/190820. Bibcode: 1982ApJS...50...55S. 
  4. ↑ 4.0 4.1 Crawford, D. L.; Barnes, J. V.; Golson, J. C. (1971). "Four-color, Hbeta, and UBV photometry for bright B-type stars in the northern hemisphere". The Astronomical Journal 76: 1058. doi:10.1086/111220. Bibcode: 1971AJ.....76.1058C. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode: 1953GCRV..C......0W. 
  7. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  8. ↑ Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z. 
  9. ↑ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770. doi:10.1093/mnras/stx1433. Bibcode: 2017MNRAS.471..770M. 
  10. ↑ 10.0 10.1 10.2 10.3 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. 
  11. ↑ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G. 
  12. ↑ Davis, George A. (1944). "The pronunciations, derivations, and meanings of a selected list of star names". Popular Astronomy 52: 8–30. Bibcode: 1944PA.....52....8D. 
  13. ↑ Galli, P. A. B.; Moraux, E.; Bouy, H.; Bouvier, J.; Olivares, J.; Teixeira, R. (2017). "A revised moving cluster distance to the Pleiades open cluster". Astronomy and Astrophysics 598: A48. doi:10.1051/0004-6361/201629239. Bibcode: 2017A&A...598A..48G. 
  14. ↑ Melis, Carl; Reid, Mark J.; Mioduszewski, Amy J.; Stauffer, John R. et al. (29 August 2014). "A VLBI resolution of the Pleiades distance controversy". Science 345 (6200): 1029–1032. doi:10.1126/science.1256101. PMID 25170147. Bibcode: 2014Sci...345.1029M. 
  15. ↑ Anthony G. A. Brown; GAIA Collaboration (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics 595: A2. doi:10.1051/0004-6361/201629512. Bibcode: 2016A&A...595A...2G. 
  16. ↑ Abramson, Guillermo (20 August 2018). "The Distance to the Pleiades According to Gaia DR2". Research Notes of the AAS 2 (3): 150. doi:10.3847/2515-5172/aada8b. Bibcode: 2018RNAAS...2..150A. 
  17. ↑ Soderblom D. R.; Nelan E.; Benedict G. F.; McArthur B. et al. (2005). "Confirmation of Errors in Hipparcos Parallaxes from Hubble Space Telescope Fine Guidance Sensor Astrometry of the Pleiades". Astronomical Journal 129 (3): 1616–1624. doi:10.1086/427860. Bibcode: 2005AJ....129.1616S. 
  18. ↑ White, T. R.; Pope, B. J. S.; Antoci, V.; Papics, P. I.; Aerts, C.; Gies, D. R.; Gordon, K.; Huber, D. et al. (November 2017). "Beyond the Kepler/K2 bright limit: variability in the seven brightest members of the Pleiades". Monthly Notices of the Royal Astronomical Society 471 (3): 2882–2901. doi:10.1093/mnras/stx1050. Bibcode: 2017MNRAS.471.2882W. 
  19. ↑ Merope, Star Names and their Meanings, Richard Hinckley Allen, Dover Publications, 1963, p. 407.
  20. ↑ Hutter, D. J.; Tycner, C.; Zavala, R. T.; Benson, J. A.; Hummel, C. A.; Zirm, H. (2021). "Surveying the Bright Stars by Optical Interferometry. III. A Magnitude-limited Multiplicity Survey of Classical Be Stars". The Astrophysical Journal Supplement Series 257 (2): 69. doi:10.3847/1538-4365/ac23cb. Bibcode: 2021ApJS..257...69H. 
  21. ↑ "IAU Working Group on Star Names (WGSN)". https://www.iau.org/science/scientific_bodies/working_groups/280/. Retrieved 22 May 2016. 
  22. ↑ "Bulletin of the IAU Working Group on Star Names, No. 1". http://www.pas.rochester.edu/~emamajek/WGSN/WGSN_bulletin1.pdf. Retrieved 28 July 2016. 
  23. ↑ "IAU Catalog of Star Names". http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt. Retrieved 28 July 2016. 

External links

Coordinates: Sky map 03h 46m 19.5739s, +23° 56′ 54.090″



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