R Andromedae

R Andromedae
Observation data; Epoch J2000 Equinox J2000
Constellation	Andromeda
Right ascension	00h 24m 01.948s
Declination	+38° 34′ 37.35″
Apparent magnitude (V)	5.8 - 15.2
Characteristics
Spectral type	S3,5e-S8,8e(M7e)
U−B color index	1.25
B−V color index	1.97
Variable type	Mira
Astrometry
Radial velocity (Rv)	-11.3 km/s
Proper motion (μ)	RA: -14.98 ± 2.73 mas/yr ; Dec.: -32.64 ± 0.96 mas/yr
Distance	532 ± 106 pc
Details
Radius	485 ± 125 R☉
Temperature	2,000 – 3,500 [citation needed] K
Other designations
	HR 90, BD +37° 58, HD 1967, SAO 53860, HIP 1901.
Database references
SIMBAD	data
Database references
SIMBAD	data

R Andromedae (R And) is a Mira-type variable star in the constellation Andromeda. Its spectral class is type S, because it shows absorption bands of zirconium monoxide in its spectrum. It was among the stars found by Paul Merrill to show absorption lines of the unstable element technetium,^[4] establishing that nucleosynthesis must be occurring in stars.

References

^ ^a ^b ^c ^d van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
^ ^a ^b ^c 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.
^ ^a ^b van Belle, G. T.; et al. (1997). "Angular Size Measurements of Carbon Miras and S-Type Stars". The Astronomical Journal. 114 (5): 2150–2156. Bibcode:1997AJ....114.2150V. doi:10.1086/118635.
^ Merrill, P. W. (1952). "Technetium in the stars". Science. 115: 479–489 [484]. Bibcode:1952Sci...115..479.. doi:10.1126/science.115.2992.479.

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