Very metal-poor galaxies: ionized gas kinematics in nine objects (2010)
Moiseev, A. V., Pustilnik, S. A., Kniazev, A. Y.
The study of ionized gas morphology and kinematics in nine eXtremely Metal-Deficient (XMD) galaxies with the scanning Fabry-Perot interferometer on the SAO 6-m telescope is presented. Some of these...
MN112: a new Galactic candidate Luminous Blue Variable (2009)
Gvaramadze, V. V., Kniazev, A. Y., Fabrika, S., Sholukhova, O., Berdnikov, L. N., Cherepashchuk, A. M., ...
We report the discovery of a new Galactic candidate Luminous Blue Variable (cLBV) via detection of an infrared circular nebula and follow-up spectroscopy of its central star. The nebula, MN112, is...
New Wolf-Rayet star and its circumstellar nebula in Aquila (2009)
Gvaramadze, V. V., Kniazev, A. Y., Hamann, W. -R., Berdnikov, L. N., Fabrika, S., Valeev, A. F.
We report the discovery of a new Wolf-Rayet star in Aquila via detection of its circumstellar nebula (reminiscent of ring nebulae associated with late WN stars) using the Spitzer Space Telescope...
SDSS J092609.45+334304.1: a nearby unevolved galaxy (2009)
Pustilnik, S. A., Tepliakova, A. L., Kniazev, A. Y., Martin, J. -M., Burenkov, A. N.
We present the results of observations of the very low surface brightness (VLSB) dwarf galaxy SDSS J092609.45+334304.1 with extreme parameters which indicate its unevolved status. Namely, its value...
Revealing evolved massive stars with Spitzer (2009)
Gvaramadze, V. V., Kniazev, A. Y., Fabrika, S.
Massive evolved stars loss a large fraction of their mass via copious stellar wind or instant outbursts and during certain evolutionary phases they can be identified via the presence of their...
Discovery of a massive variable star with Z=Zo/36 in the galaxy DDO 68 (2008)
Pustilnik, S. A., Tepliakova, A. L., Kniazev, A. Y., Burenkov, A. N.
The Local Volume dwarf galaxy DDO 68, from the spectroscopy of its two brightest HII regions (Knots 1 and 2) was designated as the second most metal-poor star-forming galaxy [12+log(O/H)=7.14]. In...
Spectroscopy of two PN candidates in IC10 (2008)
Kniazev, A. Y., Pustilnik, S. A., Zucker, D. B.
We present the results of the first spectroscopic observations of two planetary nebula (PN) candidates in the Local Group dwarf irregular galaxy IC10. Using several spectral classification diagrams,...
Andromeda IV: a new Local Volume very metal-poor galaxy (2007)
Pustilnik, S. A., Tepliakova, A. L., Kniazev, A. Y., Burenkov, A. N., ;
And IV is a low-surface brightness (LSB) dwarf galaxy at the distance of 6.1 Mpc, projecting close to M 31. In this paper the results of spectroscopy of And IV the two brightest HII regions with the...
Study DDO 68: new evidences for galaxy youth (2007)
Pustilnik, S. A., Tepliakova, A. L., Kniazev, A. Y.
DDO 68 is the second most metal-poor star-forming galaxy (12+log(O/H)=7.14). Its peculiar optical morphology and the data on its HI distribution and kinematics indicate the merger origin. We use the...
Spectroscopy of two PN candidates in IC10 (2007)
Kniazev, A. Y., Pustilnik, S. A., Zucker, D. B.
We present the results of the first spectroscopic observations of two planetary nebula (PN) candidates in the Local Group dwarf irregular galaxy IC10. Using several spectral classification diagrams...
High-quality Spectrophotometry of the Planetary Nebula in the Fornax dSph (2007)
Kniazev, A. Y., Grebel, E. K., Pustilnik, S. A., Pramskij, A. G.
We present results of NTT spectroscopy of the one known planetary nebula (PN) in the dwarf spheroidal galaxy Fornax, a gas-deficient Local Group galaxy that stopped its star formation activity a few...
HI in XMD Galaxies III. GMRT observations of BCG HS0822+3542 (2006)
Chengalur, Jayaram N., Pustilnik, S. A., Martin, J. -M., Kniazev, A. Y.
We present Giant Metrewave Radio Telescope (GMRT) HI 21-cm line data for the smallest known eXtremely Metal Deficient (XMD) blue compact galaxy (BCG) HS0822+3542. From HST imaging it has been...
A Curious New Milky Way Satellite in Ursa Major (2006)
Zucker, D. B., Belokurov, V., Evans, N. W., Kleyna, J. T., Irwin, M. J., Wilkinson, M. I., ...
In this Letter, we study a localized stellar overdensity in the constellation of Ursa Major, first identified in Sloan Digital Sky Survey (SDSS) data and subsequently followed up with Subaru imaging....
A curious Milky Way satellite in Ursa Major (2006)
Zucker, D. B., Belokurov, V., Evans, N. W., Kleyna, J. T., Irwin, M. J., Wilkinson, M. I., ...
In this Letter, we study a localized stellar overdensity in the constellation of Ursa Major, first identified in Sloan Digital Sky Survey (SDSS) data and subsequently followed up with Subaru imaging....
HS 2134+0400 - new very metal-poor galaxy, a representative of void population? (2005)
Pustilnik, S. A., Engels, D., Kniazev, A. Y., Pramskij, A. G., Ugryumov, A. V., Hagen, H. -J.
We present the SAO 6m telescope spectroscopy of a blue compact galaxy (BCG) HS 2134+0400 discovered in frame of the dedicated Hamburg/SAO survey for Low Metallicity BCGs (HSS-LM). Its very low...
Study of DDO 68: nearest candidate for a young galaxy? (2005)
Pustilnik, S. A., Kniazev, A. Y., Pramskij, A. G.
We present the results of optical spectroscopy and imaging with the SAO 6m telescope for the dwarf galaxy DDO 68 (UGC 5340 = VV 542), falling into the region of very low density of luminous (L > L*)...
The Hamburg/SAO survey for emission-line galaxies. VI. The sixth list of 126 galaxies (2005)
Pustilnik, S. A., Engels, D., Lipovetsky, V. A., Kniazev, A. Y., Pramskij, A. G., Ugryumov, A. V., ...
We present the sixth list with results of the Hamburg/SAO Survey for Emission-Line Galaxies. The final list resulted from follow-up spectroscopy conducted with the 4.5m MMT telescope in 1996, and...
SBS 0335-052 E and W: implications of new broad-band and H-alpha photometry (2004)
Pustilnik, S. A., Pramskij, A. G., Kniazev, A. Y.
We present the results of deep multicolour CCD imaging with the 6-m telescope of the pair of extremely metal-deficient gas-rich dwarf galaxies SBS 0335-052 E and W. The total magnitudes in U,B,V,R,I...
Planetary nebulae in the outer disk and halo of M31 (2004)
Grebel, E. K., Kniazev, A. Y., Zucker, D. B., Bell, E. F., Harris, H. C.
We developed a method to identify planetary nebula (PN) candidates in imaging data of the Sloan Digital Sky Survey (SDSS). This method exploits the SDSS' five-band sampling of emission lines in PN...
Starburst in HS 0822+3542 induced by the very blue LSB dwarf SAO 0822+3545 (2003)
Pustilnik, S. A., Kniazev, A. Y., Pramskij, A. G., Ugryumov, A. V., Masegosa, J.
(Abridged). One of the most metal-deficient blue compact galaxies (BCGs) HS 0822+3542 (Z=1/34 Zsun), is also one of the nearest such objects. A trigger mechanism for its current SF burst has remained...
The metallicity-luminosity relation for low surface brightness galaxies (2003)
Kniazev, A. Y., Grebel, E. K., Pramskij, A. G., Pustilnik, S. A.
We present the latest results from our survey for Low Surface Brightness Galaxies in the Sloan Digital Sky Survey (SDSS). We used public SDSS imaging data to establish a sample of all galaxies with...
Search for and study of extremely metal-deficient galaxies (2003)
Pustilnik, S. A., Kniazev, A. Y., Pramskij, A. G., Ugryumov, A. V.
We summarize the progress in identifying and observational study of extremely metal-deficient (XMD) gas-rich galaxies (BCGs, dIr and LSBDs). Due to volume limitation only the following issues are...
Starburst in HS 0822+3542 induced by the very blue LSB dwarf SAO 0822+3545 (2003)
Pustilnik, S. A., Kniazev, A. Y., Pramskij, A. G., Ugryumov, A. V., Masegosa, J.
One of the most metal-deficient blue compact galaxies (BCGs) HS 0822+3542 (Z=1/34 Zsun), is also one of the nearest such objects (D ~ 11 Mpc). It is in addition well isolated from known bright...
Ugryumov, A. V., Engels, D., Pustilnik, S. A., Kniazev, A. Y., Pramskij, A. G., Hagen, H.-J.
We present the description and the first results og a new project devoted to the search for extremely metal-deficient blue compact/H Ii-galaxies (BCGs) and to the creation of a well selected large...
The halo of M 31 as seen by SDSS (2003)
Zucker, D. B., Bell, E., Grebel, E. K., Kniazev, A. Y., Martinez-Delgado, D., Rix, H.-W., ...
The Sloan Digital Sky Survey (SDSS) 2.5m telescope observed a stripe approximately 2.5 degrees wide along the major axis of M 31, and the resulting images were processed through the SDSS pipeline. We...
Ugryumov, A. V., Engels, D., Pustilnik, S. A., Kniazev, A. Y., Pramskij, A. G., Hagen, H. J.
We present the description and the first results of a new project devoted to the search for extremely metal-deficient blue compact/HII-galaxies (BCGs) and to the creation of a well selected large BCG...
6-m Telescope Spectroscopic Observations of The Bubble Complex in NGC 6946 (2002)
Efremov, Yu. N., Pustilnik, S. A., Kniazev, A. Y., Elmegreen, B. G., Larsen, S. S., Alfaro, E. J., ...
We describe the results of a long-slit spectroscopic study of an unusual star complex in the nearby spiral galaxy NGC 6946 using the SAO 6-m telescope and the Keck 10-m telescope. The complex...
The metallicities of UM151, UM408 and A1228+12 revisited (2002)
Pustilnik, S. A., Kniazev, A. Y., Masegosa, J., Marquez, I., Pramsky, A. G., Ugryumov, A. V.
We present the results of new spectrophotometry and heavy element abundance determinations for 3 dwarf galaxies UM151, UM408 and A1228+12 (RMB132). These galaxies have been claimed in the literature...
Blue compact galaxies from SBS (Pustilnik+ 2001) (2002)
Pustilnik, S. A., Kniazev, A. Y., Lipovetsky, V. A., Ugryumov, A. V.
The work studies of the environment of low-mass galaxies with active star formation (SF) and a possible trigger of SF bursts due to gravitational interaction. Following the study by Taylor et al....
The metallicities of UM 151, UM 408 and A 1228+12 revisited (2002)
Pustilnik, S. A., Kniazev, A. Y., Masegosa, J., Márquez, I. M., Pramskij, A. G., Ugryumov, A. V.
We present the results of new spectrophotometry and heavy element abundance determinations for 3 dwarf galaxies UM 151, UM 408 and A 1228+12 (RMB 132). These galaxies have been claimed in the...
A New Extremely Low-Metallicity Galaxy Discovered in the SDSS (2002)
Kniazev, A. Y., Grebel, E. K., Hao, L., Strauss, M. A.
The SDSS spectroscopic database, which will ultimately contain spectra of one million galaxies, provides an ideal resource for searches for extremely low-metallicity galaxies. Using the current...
6-m Telescope Spectroscopic Observations of the Bubble Complex in NGC 6946 (2002)
Efremov, Yu. N., Pustilnik, S. A., Kniazev, A. Y., Elmegreen, B. G., Larsen, S. S., Alfaro, E. J., ...
The Hamburg/SAO Survey for Emission--Line Galaxies. V. The Fifth List of 161 Galaxies (2001)
Ugryumov, A. V., Engels, D., Kniazev, A. Y., Green, R. F., Izotov, Y. I., Hopp, U., ...
We present the fifth list with results of the Hamburg/SAO Survey for Emission-Line Galaxies (HSS therein, SAO -- Special Astrophysical Observatory, Russia). The list is a result of follow-up...
Environment status of blue compact galaxies and trigger of star formation (2001)
Pustilnik, S. A., Kniazev, A. Y., Lipovetsky, V. A., Ugryumov, A. V.
(abridged) The work studies active star formation (SF) and a possible trigger of SF bursts due to gravitational interaction. Following the study by Taylor et al. we extend the search for possible...
On the metallicities of UM 133, UM 283 and UM 382 (2001)
Kniazev, A. Y., Pustilnik, S. A., Ugryumov, A. V., Pramsky, A. G.
The study of group properties of the extremely metal-deficient gas-rich local dwarfs is very promising for the understanding the galaxy formation process at high redshifts. About 20 such objects have...
The Hamburg/SAO Survey for Emission--Line Galaxies. IV. The Fourth List of 119 Galaxies (2000)
Kniazev, A. Y., Engels, D., Pustilnik, S. A., Ugryumov, A. V., Kniazeva, T. F., Pramsky, A. G., ...
We present the fourth list with results of the Hamburg/SAO Survey for Emission-Line Galaxies (HSS hereafter, SAO - Special Astrophysical Observatory, Russia). The list is a result of the follow-up...
Possibly interacting Vorontsov-Velyaminov galaxies. I. Observations of VV432, VV543 and VV747 (2000)
Zasov, A. V., Kniazev, A. Y., Pustilnik, S. A., Pramsky, A. G., Burenkov, A. N., Ugryumov, A. V., ...
Among the galaxies which were included in the Atlas and Catalogue of Interacting galaxies by Vorontsov-Velyaminov (hereafter VV) as multiple systems ("nests", "chains" and similarly looking systems),...
HS 0822+3542 - a new nearby extremely metal-poor galaxy (2000)
Kniazev, A. Y., Pustilnik, S. A., Masegosa, J., Marquez, I., Ugryumov, A. V., Martin, J. -M., ...
We present the results of spectrophotometry and BVR CCD photometry, as well as integrated HI radio measurements of a new blue compact galaxy (BCG) HS 0822+3542 with extremely low oxygen abundance:...
The Hamburg/SAO Survey for Emission-Line Galaxies. III. The Third List of 81 Galaxies (2000)
Hopp, U., Engels, D., Green, R. F., Ugryumov, A. V., Izotov, Y. I., Hagen, H. -J., ...
We present the third list with results {Tables 2 to 6 are available only in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via...
SBS 0335-052W - an Extremely Low Metallicity Dwarf Galaxy (1999)
Lipovetsky, V. A., Chaffee, F. H., Izotov, Y. I., Foltz, C. B., Kniazev, A. Y., Hopp, U.
We present Multiple Mirror Telescope (MMT) and Keck II telescope spectrophotometry and 3.5m Calar Alto telescope R, I photometry of the western component of the extremely low-metallicity blue compact...