Astronomy:HD 123657

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Short description: Star in the constellation Boötes
HD 123657
(BY Boötis)
Location of BY Boö (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Boötes
Right ascension  14h 07m 55.755s[1]
Declination +43° 51′ 16.03″[1]
Apparent magnitude (V) 4.98–5.33[2][3]
Characteristics
Evolutionary stage AGB[4]
Spectral type M4.5III[5]
U−B color index 1.66[6]
B−V color index 1.58[6]
R−I color index 1.66[6]
Variable type LB[5]
Astrometry
Radial velocity (Rv)−36.24[7] km/s
Proper motion (μ) RA: +11.443[1] mas/yr
Dec.: −30.812[1] mas/yr
Parallax (π)6.0110 ± 0.1554[1] mas
Distance540 ± 10 ly
(166 ± 4 pc)
Absolute magnitude (MV)−0.90[8]
Details
Mass3.96[9] M☉
Radius131.7+3.4
−3.5[10] R☉
Luminosity1,600±130[11] L☉
Surface gravity (log g)0.66[12] cgs
Temperature3,444±125[11] K
Metallicity [Fe/H]−0.03[13] dex
Other designations
BY Boötis, HD 123657, HIP 69038, HR 5299, GSC 03040-00969, TYC 3040-969-1, BD+44°2325, IRAS 14059+4405, IRC +40253, SAO 44901
Database references
SIMBADdata

HD 123657 (BY Boötis) is a star in the northern constellation of Boötes, near the end of the handle of the Big Dipper. It is a fifth-magnitude star, and can be spotted to the unaided eye in sufficiently dark skies, far from light pollution. Based on stellar parallax measurements, it is about 540 light-years distant.

A light curve for BY Boötis, plotted from Hipparcos data[14]

This is a slow irregular variable with an apparent magnitude varying between 4.98 and 5.33.[2][3] The variability of the brightness of HD 123657 was announced by Joel Stebbins and Charles Morse Huffer in 1928, based on observations made at Washburn Observatory.[15] The star was given its variable star designation, BY Boötis, in 1973.[16]

HD 123657 has a spectral classification of M4.5III,[5] placing it as a cool red giant that exhausted its hydrogen supply. It has expanded to over 132 times the size of the Sun,[10] now radiating 1,600 times its luminosity at a cool photosphere that has an effective temperature of 3,400 K.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Samus, N. N. 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. 
  3. ↑ 3.0 3.1 "VSX : Detail for BY Boo". https://www.aavso.org/vsx/index.php?view=detail.top&oid=4405. 
  4. ↑ Alonso-Hernández, J.; Sánchez Contreras, C.; Sahai, R. (2024). "CO emission survey of asymptotic giant branch stars with ultraviolet excesses". Astronomy and Astrophysics 684: A77. doi:10.1051/0004-6361/202347317. Bibcode: 2024A&A...684A..77A. 
  5. ↑ 5.0 5.1 5.2 Alvarez, R.; Jorissen, A.; Plez, B.; Gillet, D.; Fokin, A.; Dedecker, M. (2001). "Envelope tomography of long-period variable stars". Astronomy and Astrophysics 379: 305–322. doi:10.1051/0004-6361:20011261. Bibcode: 2001A&A...379..305A. 
  6. ↑ 6.0 6.1 6.2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode: 2002yCat.2237....0D. 
  7. ↑ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F. 
  8. ↑ Park, Sunkyung; Kang, Wonseok; Lee, Jeong-Eun; Lee, Sang-Gak (2013). "Wilson-Bappu Effect: Extended to Surface Gravity". The Astronomical Journal 146 (4): 73. doi:10.1088/0004-6256/146/4/73. Bibcode: 2013AJ....146...73P. 
  9. ↑ Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R. et al. (2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics 633: A34. doi:10.1051/0004-6361/201936360. Bibcode: 2020A&A...633A..34C. 
  10. ↑ 10.0 10.1 Baines, Ellyn K.; Clark, James H.; Kingsley, Bradley I.; Schmitt, Henrique R.; Stone, Jordan M. (2025-05-07). "Vintage NPOI: New and Updated Angular Diameters for 145 Stars" (in en). The Astronomical Journal 169 (6): 293. doi:10.3847/1538-3881/adc930. ISSN 1538-3881. 
  11. ↑ 11.0 11.1 11.2 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770–791. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M. 
  12. ↑ Coelho, Paula R. T.; Bruzual, Gustavo; Charlot, Stéphane (2020). "To use or not to use synthetic stellar spectra in population synthesis models?". Monthly Notices of the Royal Astronomical Society 491 (2): 2025. doi:10.1093/mnras/stz3023. Bibcode: 2020MNRAS.491.2025C. 
  13. ↑ Marrese, P. M.; Boschi, F.; Munari, U. (2003). "High resolution spectroscopy over lambda lambda 8500-8750 Å for GAIA. IV. Extending the cool MK stars sample". Astronomy and Astrophysics 406 (3): 995. doi:10.1051/0004-6361:20030647. Bibcode: 2003A&A...406..995M. 
  14. ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access. 
  15. ↑ Stebbins, Joel; Huffer, C. M. (1928). "The Constancy of the Light of Red Stars". Publications of the Washburn Observatory 15: 137–174. Bibcode: 1928PWasO..15..137S. 
  16. ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (October 1973). "59th Name-List of Variable Stars". Information Bulletin on Variable Stars 834: 1–22. Bibcode: 1973IBVS..834....1K. https://ibvs.konkoly.hu/pub/ibvs/0801/0834.pdf. Retrieved 4 December 2024. 



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