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T Persei
	; A visual band light curve For T Persei, plotted from AAVSO data
Observation data; Epoch J2000 Equinox J2000
Constellation	Perseus
Right ascension	2h 19m 21.87717s
Declination	+58° 57′ 40.3455″
Apparent magnitude (V)	8.34-9.70
Characteristics
Spectral type	M2Iab
U−B color index	+2.62
B−V color index	+2.33
Variable type	SRc
Astrometry
Radial velocity (Rv)	−40.85 km/s
Proper motion (μ)	RA: −1.237 mas/yr ; Dec.: −0.186 mas/yr
Parallax (π)	0.4119 ± 0.0237 mas
Distance	2345±55 pc
Absolute magnitude (MV)	−6.90±0.07
Details
Mass	9-12 M☉
Radius	510±20 R☉
Luminosity	45,700+4,400; −4,000 L☉
Surface gravity (log g)	0.06±0.05 cgs
Temperature	3,750±60 K
Metallicity [Fe/H]	−0.35 dex
Other designations
	T Per, HD 14142, HIP 10829, BD+58°439, WDS J02194+5858, 2MASS J02192186+5857403, AAVSO 0212+58
Database references
SIMBAD	data

T Persei is a red supergiant located in the constellation Perseus. It varies in brightness between magnitudes 8.3 and 9.7 and is considered to be a member of the Double Cluster.

T Persei is a member of the Perseus OB1 association around the h and χ Persei open clusters, around 2 degrees north of the centre of the clusters. It is generally treated as an outlying member of the clusters.^[8] It lies half a degree away from S Persei, another red supergiant Double Cluster member.

T Per is a semiregular variable star, whose brightness varies from magnitude 8.34 to 9.7 over a period of 2,430 days.^[3] Unlike many red supergiants, it does not appear to have a long secondary period.^[4]^[9] It is relatively inactive for the red supergiant star, with low mass loss rate 8×10⁻⁶ Solar_mass/year and no detectable dust shell.^[10]

The Washington Double Star Catalog lists T Persei as having a 9th magnitude companion 0.1 arc-seconds away. This is derived from Hipparcos measurements. However, no other sources report a companion.^[11]

References

^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
^ ^a ^b ^c ^d ^e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^a ^b ^c 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.
^ ^a ^b Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society. 372 (4): 1721–1734. arXiv:astro-ph/0608438. Bibcode:2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x. S2CID 5203133.
^ ^a ^b 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.
^ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
^ ^a ^b ^c Baron, F.; Monnier, J. D.; Kiss, L. L.; Neilson, H. R.; Zhao, M.; Anderson, M.; Aarnio, A.; Pedretti, E.; Thureau, N.; Ten Brummelaar, T. A.; Ridgway, S. T.; McAlister, H. A.; Sturmann, J.; Sturmann, L.; Turner, N. (2014). "Chara/mirc Observations of Two M Supergiants in Perseus Ob1: Temperature, Bayesian Modeling, and Compressed Sensing Imaging". The Astrophysical Journal. 785 (1): 46. arXiv:1405.4032. Bibcode:2014ApJ...785...46B. doi:10.1088/0004-637X/785/1/46. S2CID 17085548.
^ Gonzalez, Guillermo; Wallerstein, George (2000). "Elemental Abundances in Evolved Supergiants. II. The Young Clusters H and χ Persei". The Astronomical Journal. 119 (4): 1839. Bibcode:2000AJ....119.1839G. doi:10.1086/301319.
^ Percy, John R.; Sato, Hiromitsu (2009). "Long Secondary Periods in Pulsating Red Supergiant Stars". Journal of the Royal Astronomical Society of Canada. 103 (1): 11. Bibcode:2009JRASC.103...11P.
^ Gordon, Michael S.; Humphreys, Roberta M.; Jones, Terry J.; Shenoy, Dinesh; Gehrz, Robert D.; Helton, L. Andrew; Marengo, Massimo; Hinz, Philip M.; Hoffmann, William F. (2017). "Searching for Cool Dust. II. Infrared Imaging of the OH/IR Supergiants, NML Cyg, VX SGR, S per, and the Normal Red Supergiants RS per and T per". The Astronomical Journal. 155 (5): 212. arXiv:1708.00018. Bibcode:2018AJ....155..212G. doi:10.3847/1538-3881/aab961. S2CID 73650032.
^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.