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HD 90512

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First radial velocities for 146 bright F- and G-type stars We have obtained an average of 5.7 radial velocities for 146 northernstars of types F and G (all luminosity classes) listed in 'A Supplementto the Bright Star Catalogue' as having no previously known radialvelocity measures. Those were obtained with charge coupled devices(CCDs) and a cross-correlation technique; the intrinsic velocityaccuracy, based on stars of apparently constant velocity, is probablyless than +/- 0.3 km/s per mean. Of those stars 14% are newly discoveredSB2 stars. The prevelance of rapid profile variations (in minutes orhours) in most of the broad-lined F-type stars makes it difficult toobtain accurate measures for them.
Einstein Observatory magnitude-limited X-ray survey of late-type giant and supergiant stars Results are presented of an extensive X-ray survey of 380 giant andsupergiant stars of spectral types from F to M, carried out with theEinstein Observatory. It was found that the observed F giants orsubgiants (slightly evolved stars with a mass M less than about 2 solarmasses) are X-ray emitters at the same level of main-sequence stars ofsimilar spectral type. The G giants show a range of emissions more than3 orders of magnitude wide; some single G giants exist with X-rayluminosities comparable to RS CVn systems, while some nearby large Ggiants have upper limits on the X-ray emission below typical solarvalues. The K giants have an observed X-ray emission level significantlylower than F and F giants. None of the 29 M giants were detected, exceptfor one spectroscopic binary.
Final catalogue of 229 photometric standards in UBV system near the selected areas 1-115 Not Available
Observations of lithium dilution and rotational velocity decay in F and G giant stars. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975ApJ...195..649A&db_key=AST
Strong-Cyanogen Stars: Photometry and Kinematics Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971ApJ...165..561J&db_key=AST
MK classifications for F and G-type stars. I. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1969AJ.....74..916H&db_key=AST
The corrected magnitudes and colours of 278 stars near S.A. 1-139 in the UBV system Not Available
Fifty standard stars for yellow and blue magnitudes in the UBV system Not Available

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:	Aslan
Sað Açýklýk:	10^h27^m12.23^s
Yükselim:	+11Â°19'01.5"
Görünürdeki Parlaklýk:	6.632
Uzaklýk:	115.875 parsek
özdevim Sað Açýklýk:	-37.8
özdevim Yükselim:	15.8
B-T magnitude:	7.729
V-T magnitude:	6.723

Kataloglar ve belirtme:

Özgün isimleri	(Edit)
HD 1989	HD 90512
TYCHO-2 2000	TYC 841-433-1
USNO-A2.0	USNO-A2 0975-06496044
HIP	HIP 51179

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