TZ Mensae

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TZ Mensae
TZMenLightCurve.png
A light curve for TZ Mensae plotted from TESS data [1]
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 05h 30m 13.8827s [2]
Declination −84° 47′ 06.366″ [2]
Apparent magnitude  (V)6.19 to 6.87 [3]
Characteristics
U−B color index −0.11 [4]
B−V color index −0.02 [4]
Variable type Algol variable [5]
A
Spectral type A0 V [6]
B
Spectral type A8 V [6]
Astrometry
Radial velocity (Rv)−0.3±0.9 [7]  km/s
Proper motion (μ)RA: −6.242  mas/yr [2]
Dec.: +43.141  mas/yr [2]
Parallax (π)8.0907 ± 0.0381  mas [2]
Distance 403 ± 2  ly
(123.6 ± 0.6  pc)
Absolute magnitude  (MV)+0.93 [8] (combined)
Orbit [9]
PrimaryA
CompanionB
Period (P)8.569  d
Semi-major axis (a)0.13  AU
Eccentricity (e)0.035±0.007
Inclination (i)88.73°
Periastron epoch (T)2442403.7085
Argument of periastron (ω)
(secondary)		295°
Semi-amplitude (K1)
(primary)		62.2 km/s
Semi-amplitude (K2)
(secondary)		102.8 km/s
Details [10]
A
Mass 2.49±0.02  M☉
Radius 1.90±0.02  R☉
Luminosity 39.8+7
−6  L☉
Surface gravity (log g)4.22±0.01 [9]   cgs
Temperature 10,543+421
−405  K
Rotational velocity (v sin i)16±4 [9]  km/s
B
Mass 1.50±0.01  M☉
Radius 1.40±0.01  R☉
Luminosity4.57+0.8
−0.7  L☉
Surface gravity (log g)4.30±0.01 [9]   cgs
Temperature 7178+303
−291  K
Rotational velocity (v sin i)12 [9]  km/s
Metallicity [Fe/H]−0.12±0.05 [6]   dex
Age 141±3 [6]   Myr
Other designations
31 G. Mensae [11] , TZ Men, CD−84°63, CPD−84°75, FK5  1659, GC  7134, HD  39780, HIP  25776, HR  2059, SAO  258418 [12]
Database references
SIMBAD data

TZ Mensae is a binary star in the southern circumpolar constellation Mensa. The system has a combined maximum apparent magnitude of 6.19, [13] placing it near the limit for naked eye visibility. Parallax measurements place the system at a distance of 403 light years. [2] The radial velocity is small. [7]

The components of TZ Mensae have stellar classifications of A0 V and A8 V, [6] both indicating that they are ordinary A-type main-sequence stars. They have masses of 1.5 and 2.5  M☉ , and radii of 1.4 and 1.9  R☉ , respectively. [10] The primary has an effective temperature of 10,543  K and a luminosity 40 times that of the Sun (L☉). [10] As for the companion, it has a temperature of 7,178 K. and a luminosity less than five L☉ [10] The rotation of both stars is apparently synchronous with the orbital period, with projected rotational velocities of 12 and 16  km/s respectively. [9] The system is estimated to be 141 million years old. [6]

The two components take about 8 days to revolve around each other in a relatively circular orbit. [9] Since the inclination is close to 90° (actually 88.7° ), [9] the two stars periodically pass in front of one another and it has been classified as a eclipsing binary, specifically the Algol type. [5] If the brighter component is eclipsing the dimmer one, the brightness drops to 6.36. [5] If vice versa, it drops to 6.87, [3] which is below the limit for naked eye visibility.

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References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 5 6 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.
  3. 1 2 Watson, C. L.; Henden, A. A.; Price, A. (May 2006). "The International Variable Star Index (VSX)". Society for Astronomical Sciences Annual Symposium. 25: 47. Bibcode:2006SASS...25...47W.
  4. 1 2 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.
  5. 1 2 3 Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. ISSN   1063-7729. S2CID   255195566.
  6. 1 2 3 4 5 6 Kovaleva, D. A. (December 2001). "Age and metallicity estimates for moderate-mass stars in eclipsing binaries". Astronomy Reports. 45 (12): 972–983. Bibcode:2001ARep...45..972K. doi:10.1134/1.1426128. eISSN   1562-6881. ISSN   1063-7729. S2CID   121028634.
  7. 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN   1063-7737. S2CID   119231169.
  8. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID   119257644.
  9. 1 2 3 4 5 6 7 8 Andersen, J.; Clausen, J. V.; Nordstrom, B. (March 1987). "Absolute dimensions of eclipsing binaries. XII. TZ Mensae". Astronomy and Astrophysics. 175: 60–70. Bibcode:1987A&A...175...60A. ISSN   0004-6361.
  10. 1 2 3 4 Malkov, O. Yu. (January 1993). "Catalogue of astrophysical parameters of binary systems". Bulletin d'Information du Centre de Donnees Stellaires. 42: 27. Bibcode:1993BICDS..42...27M. ISSN   1169-8837.
  11. ↑ 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.
  12. ↑ "TZ Men". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved July 9, 2022.
  13. ↑ 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.
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