Astronomy:SZ Crateris

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Short description: Star in the constellation Crater
SZ Crateris
250px
A visual band light curve for SZ Crateris, adapted from Cutispoto et al. (2001)[1]
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Crater
A
Right ascension  11h 21m 26.6594s[2]
Declination −20° 27′ 13.790″[2]
Apparent magnitude (V) 8.61[3]
B
Right ascension  11h 21m 26.5883s[4]
Declination −20° 27′ 09.394″[4]
Apparent magnitude (V) 11.0[3]
Characteristics
Spectral type K7V/M2.5Ve[5]
U−B color index +1.20[6]
B−V color index +1.36[6]
Variable type BY Dra[7]
Astrometry
A
Radial velocity (Rv)−0.11[2] km/s
Proper motion (μ) RA: +181.231[2] mas/yr
Dec.: −92.306[2] mas/yr
Parallax (π)76.4165 ± 0.0821[2] mas
Distance42.68 ± 0.05 ly
(13.09 ± 0.01 pc)
Absolute magnitude (MV)+7.75[8]
B
Radial velocity (Rv)−2.86[4] km/s
Proper motion (μ) RA: +220.306[4] mas/yr
Dec.: −129.404[4] mas/yr
Parallax (π)76.3549 ± 0.0955[4] mas
Distance42.72 ± 0.05 ly
(13.10 ± 0.02 pc)
Absolute magnitude (MV)+10.0[8]
Orbit[9]
Period (P)714.6 yr
Semi-major axis (a)5.896″
Eccentricity (e)0.63
Details
A
Radius0.63[2] R☉
Luminosity0.109[2] L☉
Surface gravity (log g)4.5[10] cgs
Temperature4,162[2] K
Metallicity [Fe/H]0.04[10] dex
Rotational velocity (v sin i)4.5[10] km/s
B
Radius0.593[11][lower-alpha 1] R☉
Luminosity0.0575[11][lower-alpha 2] L☉
Temperature3,670[11] K
Age194±20[12] Myr
Other designations
SZ Crt, BD−19 3242, GJ 425, HD 98712, SAO 179801, HIP 55454
A: LTT 4204[13]
B: LTT 4205[14]
Database references
SIMBADdata
A
B

SZ Crateris is a binary star system in the southern constellation Crater. Both components belong to the main sequence: the primary star has a spectral classification of K5V while the secondary is a red dwarf of spectral class M0V. The radius of the primary is about 66% the radius of the Sun, while the secondary member is only about 42% of the solar radius. In 1994, the two stars were separated by 5.1 arc seconds, which is equivalent to 112.41 astronomical units.[8]

SZ Crateris was discovered to be variable in 1985 and is classified as a marginal BY Draconis variable, with an optical variability cycle of 11.58 days.[15] The star causing the variability is unspecified[16] and the total brightness change is less than 0.1 magnitudes,[7] but the faintness of the secondary makes it likely that the primary star is the one varying in brightness.[15] Compared to the Sun, SZ Crateris has a slightly higher proportion of elements other than hydrogen and helium.[10] Based upon gyrochronology, the estimated age of this star is under 200 million years.[12]

The SZ Crateris system is a member of the Ursa Major moving group of stars that have similar motions through space.[10] The space velocity components of this system are U = +13.86±0.37, V = −3.51±1.97 and W = +1.65±1.53 km/s.[17] It is on an orbit through the Milky Way that has an orbital eccentricity of 0.092, which will bring it as close as 26.06 kly (7.99 kpc) to the galactic core, and as distant as 31.31 kly (9.60 kpc). The inclination of the orbit carries the system as much as 0.352 kly (0.108 kpc) from the plane of the galactic disk.[18]

Notes

  1. ↑ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    (5772/3670)4*0.0575=0.593 R⊙
  2. ↑ Calculating using the equation 100.4Slovene pronunciation: [{{{1}}}]Thai pronunciation: [{{{1}}}]Neukirch, Jürgen; Schmidt, Alexander; Wingberg, Kay (2000), Cohomology of Number Fields, Grundlehren der Mathematischen Wissenschaften, 323, Berlin: Springer-Verlag, ISBN 978-3-540-66671-4 Template:EscapePersian pronunciation: [{{{1}}}]{| class="wikitable" width="100%"

    ! rowspan="3" colspan="2" width="14%" style="border-bottom:2px solid grey;" | Date/Time (UTC) ! Configuration ! Serial number ! Launch site ! Outcome |-

    |style="text-align:center;background-color:#e3e9e9;" | Payload |style="text-align:center;background-color:#e3e9e9;" | Separation orbit |style="text-align:center;background-color:#e3e9e9;" | Operator |style="text-align:center;background-color:#e3e9e9;" | Function |- | colspan="4" style="text-align:center;background-color:#e4dfdf;border-bottom:2px solid grey;" | Remarks |-

    Parameter 1=time required!
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References

  1. ↑ Cutispoto, G.; Messina, S.; Rodono, M. (March 2001). "Long-term monitoring of active stars IX. Photometry collected in 1993". Astronomy & Astrophysics 367: 910–930. doi:10.1051/0004-6361:20000549. Bibcode: 2001A&A...367..910C. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 Reid, I. Neill; Cruz, Kelle L.; Allen, Peter R.; Mungall, Finlay; Kilkenny, David; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J. et al. (2004). "Meeting the Cool Neighbors. VIII. A Preliminary 20 Parsec Census from the NLTT Catalogue". The Astronomical Journal 128 (1): 463. doi:10.1086/421374. Bibcode: 2004AJ....128..463R. https://cds.cern.ch/record/728686. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  5. ↑ Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I. et al. (2015). "CARMENES input catalogue of M dwarfs". Astronomy & Astrophysics 577: A128. doi:10.1051/0004-6361/201525803. Bibcode: 2015A&A...577A.128A. 
  6. ↑ 6.0 6.1 Corben, P. M.; Carter, B. S.; Banfield, R. M.; Harvey, G. M. (1972). "U, B, V photometry of 500 southern stars". Monthly Notes of the Astronomical Society of South Africa 31: 7–22. Bibcode: 1972MNSSA..31....8C. 
  7. ↑ 7.0 7.1 Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  8. ↑ 8.0 8.1 8.2 Poveda, A.; Herrera, M. A.; Allen, C.; Cordero, G.; Lavalley, C. (1994). "Statistical studies of visual double and multiple stars. II. A catalogue of nearby wide binary and multiple systems.". Revista Mexicana de Astronomía y Astrofísica 28: 43. Bibcode: 1994RMxAA..28...43P. 
  9. ↑ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy and Astrophysics 546: A69. doi:10.1051/0004-6361/201219774. Bibcode: 2012A&A...546A..69M. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 Paulson, Diane B.; Yelda, Sylvana; Allen, Peter R.; Kilkenny, David; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R. et al. (2006). "Differential Radial Velocities and Stellar Parameters of Nearby Young Stars". The Publications of the Astronomical Society of the Pacific 118 (843): 706–715. doi:10.1086/504115. Bibcode: 2006PASP..118..706P. 
  11. ↑ 11.0 11.1 11.2 Morales, J. C.; Ribas, I.; Jordi, C.; Kilkenny, David; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R. et al. (2008). "The effect of activity on stellar temperatures and radii". Astronomy and Astrophysics 478 (2): 507. doi:10.1051/0004-6361:20078324. Bibcode: 2008A&A...478..507M. 
  12. ↑ 12.0 12.1 Barnes, Sydney A. (2007). "Ages for Illustrative Field Stars Using Gyrochronology: Viability, Limitations, and Errors". The Astrophysical Journal 669 (2): 1167–1189. doi:10.1086/519295. Bibcode: 2007ApJ...669.1167B. 
  13. ↑ "V* SZ Crt -- Variable of BY Dra type". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=SZ+Crt. Retrieved 2010-02-18. 
  14. ↑ "LTT 4205 -- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=CCDM%20J11214-2027%20B. Retrieved 2010-02-18. 
  15. ↑ 15.0 15.1 Torres, C. A. O.; Busko, I. C.; Quast, G. R. (1985). "Gl 425, a slowly rotating BY Dra-type star". Revista Mexicana de Astronomía y Astrofísica 10: 329. Bibcode: 1985RMxAA..10..329T. 
  16. ↑ Cutispoto, G. (1996). "Long-term monitoring of active stars. V. UBV(RI)_ c_ photometry collected in Feb.-Mar. 1990.". Astronomy and Astrophysics Supplement 119 (2): 281–292. doi:10.1051/aas:1996245. Bibcode: 1996A&AS..119..281C. 
  17. ↑ Karataș, Yüksel; Bilir, Selçuk; Eker, Zeki; Demircan, Osman; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R. et al. (2004). "Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution". Monthly Notices of the Royal Astronomical Society 349 (3): 1069–1092. doi:10.1111/j.1365-2966.2004.07588.x. Bibcode: 2004MNRAS.349.1069K. 
  18. ↑ Allen, C.; Herrera, M. A. (1998). "The Galactic Orbits of Nearby UV Ceti Stars". Revista Mexicana de Astronomía y Astrofísica 34: 37. Bibcode: 1998RMxAA..34...37A. 



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