Astronomy:30 Piscium

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Short description: Star in the constellation Pisces
30 Piscium
Location of 30 (also called YY) Piscium (circled). It presents in a narrow triangle with two other stars of similar brightness, 27 and 33 Piscium.
Observation data
Equinox J2000.0]] (ICRS)
Constellation Pisces
Right ascension  00h 01m 57.61947s[1]
Declination −06° 00′ 50.6540″[1]
Apparent magnitude (V) 4.31 – 4.41[2]
Characteristics
Spectral type M3 III[3]
B−V color index 1.631±0.011[4]
Variable type LPV,[5] LB?[2]
Astrometry
Radial velocity (Rv)−11.7±0.5[6] km/s
Proper motion (μ) RA: 46.941[1] mas/yr
Dec.: −40.471[1] mas/yr
Parallax (π)7.8758 ± 0.4105[1] mas
Distance410 ± 20 ly
(127 ± 7 pc)
Absolute magnitude (MV)−1.20[5]
Details
Radius109.2+5.46
−6.05[7] R☉
Luminosity1,597±177[7] L☉
Surface gravity (log g)2[8] cgs
Temperature3,490±35[7] K
Other designations
30 Psc, YY Psc, BD−06° 6345, FK5 1630, HD 224935, HIP 154, HR 9089, SAO 147042[9]
Database references
SIMBADdata

30 Piscium (HIP 154) is a solitary[10] variable star in the zodiac constellation of Pisces. It is visible to the naked eye with an apparent visual magnitude of 4.37.[8] Its calculated mid-value of antiposed parallax shift as the Earth moves around the Sun of very roughly 7.88 mas, makes it around 410 light years away.[1] Its net movement in the present epoch is one of moving closer – radial velocity (speed away from our star system) is −12 km/s.[6]

A visual band light curve for YY Piscium, plotted from data published by Tabur et al. (2009)[11]

This is an aging red giant star with a stellar classification of M3 III,[3] indicating it has exhausted the hydrogen at its core and evolved off the main sequence. It is a candidate long-period variable star[5] and has been given the designation YY Psc.[12] It varies in brightness between magnitudes 4.31 and 4.41 with no clear period. Possible periods of 23.1, 32.0, 53.6, and 167.8 days have been identified.[11] The star has 109 times the Sun's radius and is radiating 1,600 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,490 K.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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 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. 
  3. ↑ 3.0 3.1 Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245–266, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K. 
  4. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  5. ↑ 5.0 5.1 5.2 Rimoldini, L. et al. (December 2012), "Automated classification of Hipparcos unsolved variables", Monthly Notices of the Royal Astronomical Society 427 (4): 2917–2937, doi:10.1111/j.1365-2966.2012.21752.x, Bibcode: 2012MNRAS.427.2917R. 
  6. ↑ 6.0 6.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  7. ↑ 7.0 7.1 7.2 7.3 Baines, Ellyn K.; Thomas Armstrong, J.; Clark, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David et al. (2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal 162 (5): 198. doi:10.3847/1538-3881/ac2431. Bibcode: 2021AJ....162..198B. 
  8. ↑ 8.0 8.1 Pérez Martínez, M. I. et al. (November 2014), "The non-active stellar chromosphere: Ca II basal flux", Monthly Notices of the Royal Astronomical Society 445 (1): 270–279, doi:10.1093/mnras/stu1706, Bibcode: 2014MNRAS.445..270P. 
  9. ↑ "30 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=30+Psc. 
  10. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  11. ↑ 11.0 11.1 Tabur, V; Bedding, T. R; Kiss, L. L; Moon, T. T; Szeidl, B; Kjeldsen, H (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society 400 (4): 1945. doi:10.1111/j.1365-2966.2009.15588.x. Bibcode: 2009MNRAS.400.1945T. 
  12. ↑ Kukarkin, B. V. et al. (January 1975), "60th Name-List of Variable Stars", Information Bulletin on Variable Stars 961: 1, Bibcode: 1975IBVS..961....1K. 

Coordinates: Sky map 00h 01m 57.6s, −06° 50′ 50.7″



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