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CCD photometry and visual observations of V1663 Aquilae (Nova Aquilae 2005).
We present CCD V and I band photometry and visual observations of V1663Aquilae (Nova Aquilae 2005). This was a classical fast nova, probably oftype Ba, observed for the first time on 2005 June 9. Maximum lightoccurred at HJD= 2453531.2 +/- 0.2, when the apparent V magnitude was10.7 +/- 0.1 and the V-I colour index 3.1. Decline times were t2,V= 17d,t2,I= 18d, t3,V= 32d and t3,I= 35d. We derived a maximum absolute Vmagnitude of -7.8 +/- 0.2, colour excess E(B-V)= 2, extinction AV= 6magnitudes and distance d= 2.9 +/- 0.4 kpc. After maximum the V-I colourindex remained between 3.1 and 3.4 for 50 days, then gradually reducedas the nova became bluer with increasing age. We saw no direct evidenceof dust emission although this could have contributed to the highextinction in the direction of the nova.
| Catalogue of H-alpha emission stars in the Northern Milky Way
The ``Catalogue of Stars in the Northern Milky Way Having H-alpha inEmission" appears in Abhandlungen aus der Hamburger Sternwarte, Band XIin the year 1997. It contains 4174 stars, range {32degr <= l() II< 214degr , -10degr < b() II < +10degr } having the Hαline in emission. HBH stars and stars of further 99 lists taken from theliterature till the end of 1994 were included in the catalogue. We givethe cross-identification of stars from all lists used. The catalogue isalso available in the Centre de Données, Strasbourg ftp130.79.128.5 or http://cdsweb.u-strasbg.fr and at the HamburgObservatory via internet.
| Catalogue of stars in the northern Milky Way having H-alpha in emission
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| An Einstein Observatory SAO-based catalog of B-type stars
About 4000 X-ray images obtained with the Einstein Observatory are usedto measure the 0.16-4.0 keV emission from 1545 B-type SAO stars fallingin the about 10 percent of the sky surveyed with the IPC. Seventy-fourdetected X-ray sources with B-type stars are identified, and it isestimated that no more than 15 can be misidentified. Upper limits to theX-ray emission of the remaining stars are presented. In addition tosummarizing the X-ray measurements and giving other relevant opticaldata, the present extensive catalog discusses the reduction process andanalyzes selection effects associated with both SAO catalog completenessand IPC target selection procedures. It is concluded that X-rayemission, at the level of Lx not less than 10 exp 30 ergs/s, is quitecommon in B stars of early spectral types (B0-B3), regardless ofluminosity class, but that emission, at the same level, becomes lesscommon, or nonexistent, in later B-type stars.
| Discoveries on Southern Red Sensitive Objective-Prism Plates - Part Three - New Stars Having Hα in Emission
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1981A&AS...44..387M&db_key=AST
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