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Optical and radio variability of the BL Lacertae object AO 0235+16: A possible 5-6 year periodicity
The BL Lacertae object AO 0235+16 is well known for its extreme optical and radio variability. New optical and radio data have been collected in the last four years by a wide internationalExpand
An AGN sample with high X-ray-to-optical flux ratio from RASS. I. The optical identification
We present the rst results of a program to identify the unknown bright active galactic nuclei (AGN) in the ROSAT All Sky Survey Bright Source Catalog (RASS-BSC). We have used logC +0 : 4Ras anExpand
The Study of a Type IIb Supernova: SN 1996cb
We present spectroscopic and photometric results of SN 1996cb. The supernova was independently discovered in NGC 3510 by M. Aoki, T. Cho, & K. Toyama of Japan and Qiao et al. of Beijing AstronomicalExpand
Spectroscopic Confirmation of 55 Northern and Equatorial Cataclysmic Variables. I. 27 Confirmed Cataclysmic Variables
From the Downes et al. catalog of cataclysmic variables, we selected 55 program stars, which are accessible and either do not have any published quiescent spectrum or have a reference spectrum thatExpand
A large sample of low surface brightness disc galaxies from the SDSS – I. The sample and the stellar populations
We present the properties of a large sample (12 282) of nearly face-on low surface brightness (LSB) disc galaxies selected from the main galaxy sample of SDSS-DR4. These properties include B-bandExpand
Newly discovered candidate weak-line T Tauri stars in the surrounding area of the Taurus-Auriga region
We present results of an extensive search for weak-line T Tauri stars (WTTS) in the outskirts of the Taurus-Auriga molecular cloud on the basis of the ROSAT All-Sky Survey Bright Source Catalog. OurExpand
Spectrum Analysis of the Type IB Supernova SN 1999DN: Probable Identifications of C II and Hα
Low-resolution spectra of SN 1999dn at early times are presented and compared with synthetic spectra generated with the parameterized supernova synthetic spectrum code SYNOW. We find that the spectraExpand
Spectroscopic Confirmation of 55 Northern and Equatorial Cataclysmic Variables. II. 28 Disproved and Suspected Cataclysmic Variable Candidates
This is the second paper of our spectroscopic confirmation of 55 CV candidates listed in the Downes et al. catalog of cataclysmic variables. Twenty-seven confirmed CVs have been published in theExpand
A large sample of low surface brightness disc galaxies from the SDSS – II. Metallicities in surface brightness bins
We study the spectroscopic properties of a large sample of low surface brightness galaxies (LSBGs) [with B-band central surface brightness μ0(B) > 22 mag arcsec −2 ] selected from the Sloan DigitalExpand
Candidate Milky Way satellites in the Galactic halo
Aims. Sloan Digital Sky Survey (SDSS) DR5 photometric data with 120 ◦ <α <270 ◦ ,2 5 ◦ <δ< 70 ◦ were searched for new Milky Way companions or substructures in the Galactic halo. Methods. FiveExpand
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