HD 128333

HD 128333 or CH Boötis is an irregular variable star in the northern constellation of Boötes. It is currently on the asymptotic giant branch of the HR diagram.^[4]

HD 128333

A light curve for CH Boötes, plotted from Hipparcos data[1]
Observation data Epoch J2000      Equinox J2000
Constellation	Boötes
Right ascension	14h 34m 39.62069s[2]
Declination	+49° 22′ 06.0729″[2]
Apparent magnitude (V)	5.74[3]
Characteristics
Evolutionary stage	AGB[4]
Spectral type	M1III[4]
U−B color index	+1.88[3]
B−V color index	+1.56[3]
Variable type	Lb[5]
Astrometry
Radial velocity (Rv)	−23.93[6] km/s
Proper motion (μ)	RA: −45.517[2] mas/yr Dec.: +49.940[2] mas/yr
Parallax (π)	4.6569 ± 0.0526 mas[2]
Distance	700 ± 8 ly (215 ± 2 pc)
Absolute magnitude (MV)	−0.32[7]
Details
Mass	1.13[8] M☉
Radius	67[9] R☉
Luminosity	869[9] L☉
Surface gravity (log g)	1.00[8] cgs
Temperature	3,734[8] K
Metallicity [Fe/H]	+0.10[8] dex
Other designations
CH Boötis, BD+50 2095, FK5 3155, HD 128333, HIP 71280, HR 5452, SAO 45121.
Database references
SIMBAD	data

References

1. "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
2. 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.
3. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
4. Eggen, O. J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
5. Lebzelter, T.; Hinkle, K. H. (October 2002), "Velocity variability of semiregular and irregular variables", Astronomy and Astrophysics, 393 (2): 563–571, Bibcode:2002A&A...393..563L, doi:10.1051/0004-6361:20021085.
6. Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
7. Gontcharov, G. A. (2017). "VizieR Online Data Catalog: Tycho-2 red giant branch and carbon stars (Gontcharov, 2011)". VizieR On-Line Data Catalog. Bibcode:2017yCat..90370769G.
8. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevic, G.; Monari, G.; Cantat-Gaudin, T. (2019-08-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
9. McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711.

External links

• HR 5452 VizieR Bright Star Catalog entry
• Image HD 128333