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HD 125039


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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.

Radial-velocity measurements. V - Ground support of the HIPPARCOS satellite observation program
The paper presents data on 1070 radial velocity measurements of starsdistributed in 39 fields measuring 4 deg x 4 deg. The PPO series ofFehrenbach et al. (1987) and Duflot et al. (1990) is continued using theFehrenbach objective prism method.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Coban
Sað Açýklýk:14h16m29.06s
Yükselim:+26°37'44.1"
Görünürdeki Parlaklýk:8.377
Uzaklýk:77.7 parsek
özdevim Sað Açýklýk:29.6
özdevim Yükselim:56.8
B-T magnitude:8.908
V-T magnitude:8.421

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 125039
TYCHO-2 2000TYC 2010-549-1
USNO-A2.0USNO-A2 1125-06924584
HIPHIP 69743

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