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Neutral-gas-phase metal abundances in Zn II-selected quasar absorption line systems near redshift z = 1.2
Turnshek, David A.; Rao, Sandhya M.; Monier, Eric M. +2 more
We present 10 metallicity measurements for quasar absorbers near z = 1.2 that were selected for having unusually significant Zn II absorption in their Sloan Digital Sky Survey (SDSS) spectra. Follow-up UV space spectroscopy of the Lyα region shows that all 10 have damped Lyα (DLA) absorption, corresponding to neutral hydrogen column densities in t…
Flares activity of selected stars from GTSh10 catalog by CRTS data
Gorbachev, M. A.; Shlyapnikov, A. A.
Based on the database of photometric observations of the CRTS project over an interval of more than 9 years, the activity of red dwarfs from the GTSh10 catalog was analyzed. The total number of analyzed objects, a list ares, amplitudes and moments of recorded events are presented. For the most interesting objects, from the point of view are activi…
SB 796: a high-velocity RRc star
Soszyński, Igor; Gomel, Roy; Faigler, Simchon +6 more
We report here on a detailed study of a c-type RR Lyrae variable (RRc variable), SB 796, serendipitously discovered in a search of the WASP public data for stars that display large photometric periodic modulation. SB 796 displays a period of P = 0.26585 d and semi-amplitude of ∼0.1 mag. Comparison of the modulation shape and period with the detail…
Long-Term Activity of a Little Known Dwarf Nova DT Octantis
Šimon, V.; Edelmann, H.
We analyze the long-term activity of a little known dwarf nova (DN) DT Oct. We use photographic observations from the Bamberg Observatory (Southern Patrol Photographic Sky Survey), CCD data from ASAS-3 survey, and AAVSO data (both CCD and visual). We determined the recurrence times of the superoutbursts, TCso, and of the normal outburst…
A new binary star system of EA type in Perseus: UCAC4 735-019611
Brincat, S. M.; Galdies, C.; Grech, W.
Discovery of a new binary star system (UCAC4 735-019611=USNO-B1.0 1469-0068570=2MASS J01561032+5657563) in the Perseus constellation is presented. It was discovered during asteroid photometric work. The shape of the light curve and its characteristics (period of 2.12701±0.00001d, amplitude of V=0.55 mag, initial minimum period epoch HJD 2457363.37…
Automatic Detection and Tracking of Plumes from 67P/Churyumov-Gerasimenko in Rosetta/OSIRIS Image Sequences
Sierks, Holger; Thompson, David R.; Brown, David +2 more
Solar system bodies such as comets and asteroids are known to eject material from their surface in the form of jets and plumes. Observations of these transient outbursts can offer insight into the inner workings and makeup of their originating body. However, the detection of and response to these events has thus far been manually controlled by gro…
Astrometric planet search around southern ultracool dwarfs. IV. Relative motion of the FORS2/VLT CCD chips
Sahlmann, J.; Lazorenko, P. F.
We present an investigation of the stability of the two chips in the FORS2 camera CCD mosaic on the basis of astrometric observations of stars in 20 sky fields, some of which were monitored for four to seven years. We detected a smooth relative shear motion of the chips along their dividing line that is well approximated by a cubic function of tim…
The Sejong Open cluster Survey (SOS) VI. A small star-forming region in the high Galactic latitude molecular cloud MBM 110
Song, Inseok; Bessell, Michael S.; Sung, Hwankyung
We present optical photometric, spectroscopic data for the stars in the high Galactic latitude molecular cloud MBM 110. For the complete membership selection of MBM 110, we also analyse Wide-field Infrared Survey Explorer(WISE) mid-infrared data and Gaia astrometric data. Membership of individual stars is critically evaluated using the data mentio…
Cloud G074.11+00.11: a stellar cluster in formation
Kim, Kee-Tae; Liu, Sheng-Yuan; Zhang, Qizhou +9 more
Context. We present molecular line and dust continuum observations of a Planck-detected cold cloud, G074.11+00.11. The cloud consists of a system of curved filaments and a central star-forming clump. The clump is associated with several infrared sources and H2O maser emission.
Aims: We aim to determine the mass distribution and gas…
Faint, high proper motion star candidates selected from the SDSS and PS1 catalogues
Ofek, Eran O.; Segev, Noam
High proper motion stars probe several extreme stellar populations, including nearby objects, Galactic halo stars, and hypervelocity stars. Extending the search for high proper motion stars, to faint limits can increase their numbers and help to identify interesting targets. We conduct a search for faint (rSDSS > 19.5 mag) high prope…