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HD 89773


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DSS Images   Other Images


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GPM - compiled catalogue of absolute proper motions of stars in selected areas of sky with galaxies.
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Limits on the short-timescale near-infrared variability of Seyfert 1 nuclei
We present new time-resolved photometric observations and images at 2.2microns of a small sample of X-ray variable Seyfert 1 nuclei. Aftercorrecting for dilution by the host galaxy in the observing aperture, wecompare the fractional variation, over the timescales of theobservations, in the near-infrared (NIR) to that expected in the X rays.We have not detected with confidence any NIR variability on timescalesshort enough to be incompatible with the dust reradiation scenario. Thegalaxy-corrected upper limits which we have obtained for variations onshort timescales, typical of non-thermal processes, imply that the NIRemission is dominated by a slowly varying, presumably reprocessed,component which accounts for no less than 80%-90% of the total.

Jupiter and Galilean satellites' positions obtained in April 1978 with the GPO 40 CM /f = 4 m/ of the ESO, La Silla
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&AS...40..375D&db_key=AST

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Aslan
Sað Açýklýk:10h21m53.77s
Yükselim:+19°47'35.4"
Görünürdeki Parlaklýk:8.914
özdevim Sað Açýklýk:-53.4
özdevim Yükselim:-30.2
B-T magnitude:9.477
V-T magnitude:8.961

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 89773
TYCHO-2 2000TYC 1423-226-1
USNO-A2.0USNO-A2 1050-06264465
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