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HD 138483

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A magnitude limited stellar X-ray survey and the F star X-ray luminosity function An X-ray survey has been conducted of stars brighter than visualmagnitude 8.5 that have serendipitously fallen into the fields of viewof the Imaging Proportional Counter of the Einstein Observatory. Thesurvey includes 227 separate 1 x 1 deg fields, containing 274 stars witha visual magnitude of no more than 8.5 and covering a wide range ofspectral types and luminosity classes. X-ray emission was detected from33 stars, and upper limits have been determined for the remainder of thesample. F type stars dominate the detected sample, and most of these areshown to be dwarfs. An X-ray luminosity function for dF stars has beendeduced, and reveals that the average 0.2-4.0 keV luminosity of thesestars is around 10 to the 29th erg/sec. Constraints have been placed onthe high luminosity tails and medians of the X-ray luminosity functionsfor other types of stars.
Über die Veränderlichkeit der Sterne des Spektraltyps A Not Available
List of errors found in the Henry Draper Catalogue Not Available
Positions et Mouvements propres de 357 Etoiles de Repère de la Zone + 16° à + 18° pour l'époque et l'équinoxe 1950,0 Not Available

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Osservazione e dati astrometrici

Costellazione:	Serpente
Ascensione retta:	15^h31^m48.48^s
Declinazione:	+16Â°14'04.1"
Magnitudine apparente:	7.451
Distanza:	121.803 parsec
Moto proprio RA:	-8.6
Moto proprio Dec:	-7.1
B-T magnitude:	7.698
V-T magnitude:	7.472

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 138483
TYCHO-2 2000	TYC 1494-412-1
USNO-A2.0	USNO-A2 1050-07533886
HIP	HIP 76043

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