منابع مشابه
Star Cluster Survey . III . The White Dwarf Cooling Age of the Rich Open Star Cluster NGC 2099 ( M 37 )
We present deep CCD photometry of the very rich, intermediate aged (similar to the Hyades) open star cluster NGC 2099 (M37). The V, B−V color-magnitude diagram (CMD) for the cluster shows an extremely well populated and very tightly constrained main-sequence extending over 12 magnitudes from the turn-off. Both a well defined main-sequence turn-off and a red giant population are also clearly evi...
متن کاملLuminous Red Variable Star
We report photometry and spectroscopy of the evolution of Nova Sagittarii 1994 #1 (V4332 Sagittarii) during outburst. We compare the photometric and spectral evolution of this outburst to known classes of outbursts – including classical novae and outbursts occurring on symbiotic stars – and find this object does not conform to any known class of outburst. The closest match to the behavior of th...
متن کاملNear Infrared Photometry of Galactic Globular Clusters M 56 and M 15 . Extending the Red Giant Branch vs . Metallicity Calibration
Infrared JKs-band photometry of the Galactic globular clusters M15 and, for the first time, M56 is presented. We estimated the reddening (E(B − V) = 0.18 ± 0.08 mag) and distance modulus ((m − M)V = 15.43 ± 0.30 mag) towards the poorly studied globular cluster M56. We combined our data with observations of other clusters from the literature (12 in total) to extend the [Fe/H] vs. Red Giant Branc...
متن کاملFaint star counts in the near - infrared
Received ; accepted – 2 – ABSTRACT We discuss near-infrared star counts at the Galactic pole with a view to guiding the NGST and ground-based NIR cameras. Star counts from deep K-band images from the CFHT are presented, and compared with results from the 2MASS survey and some Galaxy models. With appropriate corrections for detector artifacts and galaxies, the data agree with the models down to ...
متن کاملStar Formation near Supermassive Black Holes
Supermassive black hole accretion and star formation appear intimately connected. I review the observational and theoretical evidence for this statement. I then discuss how focussed studies of two systems, our Galactic Center and the nucleus of M87, can help to improve our understanding of these processes.
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ژورنال
عنوان ژورنال: Nature
سال: 1924
ISSN: 0028-0836,1476-4687
DOI: 10.1038/114313b0