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HD 197378


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Improved Astrometry for Variable Stars
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Semiregular variables of types SRa and SRb - Basic properties in the visual and the IRAS-range
The pulsational properties, T(eff)s, mass loss rates, luminosities,scale heights, and volume densities in the Galactic plane are presentedfor samples of optical semiregular variables of types SRa and SRbcorrelated with the IRAS point source catalog. These properties arecompared to the corresponding characteristics of optical Mira variables.It is found that the SRa's are not a distinct class of variables but amixture of 'intrinsic' Miras and SRb's. The O-rich SRb's form a quitehomogeneous group in terms of periods, amplitudes, and temperatures.They consist of a 'blue' group with no indication of circumstellarshells, with P less than 150 d and T(eff) greater than 3200 K, and a'red' group with temperatures and mass loss rates comparable to Mirasbut periods about a factor of two smaller. The C-rich SRVs generallyhave smaller periods and are more abundant than C-rich Miras. Theevolutionary status of the SRVs is discussed.

64th Name-List of Variable Stars
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A New Red Semiregular Variable Star: BD +18 4590
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Photoelectric photometry of Nova Delphini 1967
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970PASP...82..626M&db_key=AST

The Abundance of Lithium in Early M-Type Stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1967ApJ...147..587M&db_key=AST

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Dades d'Observació i Astrometria

Constel·lació:Delphinus
Ascensió Recta:20h42m49.50s
Declinació:+19°11'07.1"
Magnitud Aparent:9.013
Moviment propi RA:26.8
Moviment propi Dec:-6.5
B-T magnitude:11.178
V-T magnitude:9.192

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 197378
TYCHO-2 2000TYC 1642-526-1
USNO-A2.0USNO-A2 1050-18447746
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