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HD 197378

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Improved Astrometry for Variable Stars Not Available
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 Not Available
A New Red Semiregular Variable Star: BD +18 4590 Not Available
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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Osservazione e dati astrometrici

Costellazione:	Delfino
Ascensione retta:	20^h42^m49.50^s
Declinazione:	+19Â°11'07.1"
Magnitudine apparente:	9.013
Moto proprio RA:	26.8
Moto proprio Dec:	-6.5
B-T magnitude:	11.178
V-T magnitude:	9.192

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 197378
TYCHO-2 2000	TYC 1642-526-1
USNO-A2.0	USNO-A2 1050-18447746

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