ZZ Boötis

A visual band light curve for ZZ Boötes, adapted from McNamara et al. (1971)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 13h 56m 09.5178s[2]
Declination +25° 55′ 07.3547″[2]
Apparent magnitude (V) 6.79–7.44[3]
Characteristics
Spectral type F2 IV-V + F2 IV-V[4]
B−V color index +0.36[5]
Variable type Algol[3]
Astrometry
Radial velocity (Rv)-29.50[6] km/s
Proper motion (μ) RA: −97.004±0.057[2] mas/yr
Dec.: −6.164±0.061[2] mas/yr
Parallax (π)9.3114 ± 0.0381 mas[2]
Distance350 ± 1 ly
(107.4 ± 0.4 pc)
Absolute bolometric
magnitude (Mbol)		2.17 / 2.30[4]
Orbit[4]
Period (P)4.991744 d
Inclination (i)88.6 ± 0.1°
Semi-amplitude (K1)
(primary)		93.7 ± 2.1 km/s
Semi-amplitude (K2)
(secondary)		94.0 ± 2.1 km/s
Details
ZZ Boo A
Mass1.71 ± 0.06[4] M☉
Radius2.28 ± 0.06[4] R☉
Luminosity10.7[4] L☉
Surface gravity (log g)3.72 ± 0.10[7] cgs
Temperature6,860 ± 20[7] K
Metallicity [Fe/H]−0.10 ± 0.08[7] dex
Rotational velocity (v sin i)11.9 ± 0.4[7] km/s
ZZ Boo B
Mass1.70 ± 0.06[4] M☉
Radius2.15 ± 0.06[4] R☉
Luminosity9.95[4] L☉
Surface gravity (log g)3.84 ± 0.10[7] cgs
Temperature6930 ± 20[7] K
Metallicity [Fe/H]−0.03 ± 0.10[7] dex
Rotational velocity (v sin i)19.3 ± 0.8[7] km/s
Other designations
ZZ Boo, HD 121648, HIP 68064, SAO 83080, BD+26°2508[8]
Database references
SIMBADdata

ZZ Boötis is a star system in the constellation Boötes. It varies from magnitude 6.79 to 7.44 over five days.[9] Based on its parallax, measured by the Gaia spacecraft, it is about 350 light-years (110 parsecs) away.[2]

Observational history

In 1950 Grigory Shajn determined that this star is a double-lined spectroscopic binary, with an approximate period of 4.96 days. Sergei Gaposchkin found from an examination of photographic plates, in 1951, that it was an Algol-type eclipsing binary system.[10] The primary and secondary eclipses are of equal depth, 0.65 magnitudes, meaning the brightness drops by nearly half.[3] The eclipses make up only 6% of the orbital period.[9]

ZZ Boötis is a binary star system, specifically an eclipsing binary.[9] The component stars appear to be of almost equal mass, differing by only 3%.[5]

References

  1. ↑ McNamara, D. H.; Hansen, H. K.; Wilcken, S. K. (April 1971). "Photometry of the Eclipsing Star ZZ Bootis". Publications of the Astronomical Society of the Pacific. 83 (492): 192. Bibcode:1971PASP...83..192M. doi:10.1086/129099. S2CID 119982496. Retrieved 7 November 2021.
  2. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. 1 2 3 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.
  4. 1 2 3 4 5 6 7 8 9 Cester, B.; Giuricin, G.; Mardirossian, F.; Mezzetti, M. (1978). "Revised spectrographic and photometric elements of ZZ Boo". Astronomy and Astrophysics Supplement Series. 32: 347–350. Bibcode:1978A&AS...32..347C.
  5. 1 2 Popper, D. M. (1983). "The F-type eclipsing binaries ZZ Bootis, CW Eridani, and BK Pegasi". Astronomical Journal. 88: 1242–56. Bibcode:1983AJ.....88.1242P. doi:10.1086/113415. ISSN 0004-6256.
  6. ↑ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
  7. 1 2 3 4 5 6 7 8 Kang, Young-Woon; Yushchenko, Alexander; Hong, Kyengsoo; Kim, Sungeun; Yushchenko, Volodymyr (2012). "Chemical Composition of the Components of Eclipsing Binary Star ZZ Bootis". The Astronomical Journal. 144 (2): 35–45. Bibcode:2012AJ....144...35K. doi:10.1088/0004-6256/144/2/35.
  8. ↑ "ZZ Boo". SIMBAD. Centre de données astronomiques de Strasbourg.
  9. 1 2 3 Watson, Christopher (4 January 2010). "ZZ Boötis". AAVSO Website. American Association of Variable Star Observers. Retrieved 5 August 2014.
  10. ↑ Gaposchkin, S. (1951). "The system of RZ Eridani and a new bright eclipsing variable with double-lined spectrum". The Astronomical Journal. 56: 125. Bibcode:1951AJ.....56..125G. doi:10.1086/106546.
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