Star in the constellation Mensa
θ Mensae , Latinized to Theta Mensae , is a star located in the southern circumpolar constellation Mensa . It has an apparent magnitude of 5.45,[ 2] naked eye if viewed under ideal conditions. Based on parallax measurements from Gaia Data Release 3 , the object is estimated to be 385 light years distant.[ 1] radial velocity of km/s [ 7]
This is a solitary,[ 16] B-type main-sequence star with a stellar classification of B9.5 V.[ 4] [ 17] luminosity class of a giant star and a subgiant . Nevertheless, Theta Mensae has 2.87 times the Sun ’s mass[ 3] radius of 4.37 R ☉ .[ 9] solar luminosities [ 10] photosphere and it has an effective temperature of 9,938 K ,[ 11] million years old, having completed 85.2% of its main sequence lifetime,[ 3] projected rotational velocity of km/s [ 13]
Data from the Transiting Exoplanet Survey Satellite suggests that Theta Mensae may be a slowly pulsating B-type star plus a variable star with rotation modulations [ 6]
References
^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A&A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source at VizieR .^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27 – L30 . Bibcode :2000A&A...355L..27H . ISSN 0004-6361 . ^ a b c d e Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars" . Astronomy & Astrophysics . 537 : A120. arXiv :1201.2052 Bibcode :2012A&A...537A.120Z . doi :10.1051/0004-6361/201117691 eISSN 1432-0746 . ISSN 0004-6361 . ^ a b Buscombe, W. (1 May 1969). "Line Strengths for Southern OB stars--II: Observations with Moderate Dispersion" . Monthly Notices of the Royal Astronomical Society . 144 (1): 31– 39. Bibcode :1969MNRAS.144...31B . doi :10.1093/mnras/144.1.31 ISSN 0035-8711 . ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory . 4 : 99– 110. Bibcode :1966CoLPL...4...99J . ^ a b Pedersen, May G.; et al. (8 February 2019). "Diverse Variability of O and B Stars Revealed from 2-minute Cadence Light Curves in Sectors 1 and 2 of the TESS Mission: Selection of an Asteroseismic Sample" . The Astrophysical Journal . 872 (1): L9. arXiv :1901.07576 Bibcode :2019ApJ...872L...9P . doi :10.3847/2041-8213/ab01e1 eISSN 2041-8213 . ^ a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 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– 896. arXiv :0705.0878 Bibcode :2007AN....328..889K . doi :10.1002/asna.200710776 . eISSN 1521-3994 . ISSN 0004-6337 . S2CID 119323941 . ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331– 346. arXiv :1108.4971 Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . eISSN 1562-6873 . ISSN 1063-7737 . S2CID 119257644 . ^ a b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3" . Astronomy & Astrophysics . 657 : A7. arXiv :2109.10912 Bibcode :2022A&A...657A...7K . doi :10.1051/0004-6361/202142146 eISSN 1432-0746 . ISSN 0004-6361 . ^ a b c Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List" . The Astronomical Journal . 158 (4): 138. arXiv :1905.10694 Bibcode :2019AJ....158..138S . doi :10.3847/1538-3881/ab3467 eISSN 1538-3881 . ^ a b Paunzen, E.; Schnell, A.; Maitzen, H. M. (December 2005). "An empirical temperature calibration for the Δa photometric system I: The B-type stars" . Astronomy & Astrophysics . 444 (3): 941– 946. arXiv :astro-ph/0509049 Bibcode :2005A&A...444..941P . doi :10.1051/0004-6361:20053546 eISSN 1432-0746 . ISSN 0004-6361 . ^ Barraza, L. F.; Gomes, R. L.; Messias, Y. S.; Leão, I. C.; Almeida, L. A.; Janot-Pacheco, E.; Brito, A. C.; Brito, F. A. C.; Santana, J. V.; Gonçalves, N. S.; das Chagas, M. L.; Teixeira, M. A.; De Medeiros, J. R.; Canto Martins, B. L. (1 January 2022). "Rotation Signature of TESS B-type Stars. A Comprehensive Analysis" . The Astrophysical Journal . 924 (2): 117. arXiv :2202.01022 Bibcode :2022ApJ...924..117B . doi :10.3847/1538-4357/ac3335 eISSN 1538-4357 . ISSN 0004-637X . ^ a b Levato, H.; Grosso, M. (June 2004). "New Projected Rotational Velocities of All Southern B-type Stars of the Bright Star Catalogue". Astronomical Society of the Pacific . 215 : 51. Bibcode :2004IAUS..215...51L . ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino . 1 . Bibcode :1879RNAO....1.....G . ^ "Theta Mensae" . SIMBAD Centre de données astronomiques de Strasbourg .^ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems" . Monthly Notices of the Royal Astronomical Society . 389 (2): 869– 879. arXiv :0806.2878 Bibcode :2008MNRAS.389..869E . doi :10.1111/j.1365-2966.2008.13596.x eISSN 1365-2966 . ISSN 0035-8711 . ^ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53° . Bibcode :1975mcts.book.....H .
