... Flux density at 1 GHz (/Jy): 310 . ... Optical: Diffuse emission. ... Distance: H I observations suggest 1.9 kpc. ... ADS . ... 1973, ApJS, 26, 19. ... VLA at 1.4 GHz (8'') 4.9 GHz (3'') and 15 GHz (1'') of central region only, plus Einstein image of central region. ... VLA at 327 MHz (3'.1?4'.4: S=660 Jy). ... VLA of associated OH masers. ... 2000, ApJ, 540, 842. ... VLA at 328 MHz (97''?52'': S=425?40 Jy) and 1415 MHz (88''?48'': S=246?20 Jy), and comparison with other observations. ...

... Observing . ... Solar Observing . ... April 3 (SUN) - Solar Observing, Central Park , Manhattan . ... APRIL'S SKY . ... Lecture Series at the American Museum of Natural History The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the .. ... The€аAmateur Astronomers Association of New York€аwas organized in 1927 to promote the study of Astronomy, emphasizing its cultural and inspirational value. ...

This is the homepage of Andrew Fruchter, an astronomer on the staff of the Space Telescope Science Institute . ... Here you can look at an HST images of the optical counterparts of gamma-ray bursts and their host galaxies. ... Therefore, substantial information on the fine scale structure of objects can be obtained by offsetting the pointing of the telescope between exposures and then combining these "dithered" exposures into a single image. ...

... The stars examined here were primarily culled from two lists of X--ray sources in Orion. ... The second region is two degrees in extent east--west and ten degrees north--south with Orionis being near the northern edge. ... In the end, two main regions were chosen for monitoring: stars near Orionis and stars northwest of the belt of Orion. ... The PSPC identified 22 sources within 15 of Orionis in addition to the sources listed in Table 1 , giving a total of 85 X--ray sources in the Orionis region. ...

... A typical spectrum (such as Figure 1) shows the classic triple-peaked spectrum, which is associated with masers located in a circumnuclear disk (e.g. NGC 4258, Nakai et al., ... The Circinus galaxy megamasers are known to be variable on timescales of weeks and months with individual maser features having a lifetime of around one year. ... Most of the masers observed showed some degree of variability over an hour while one feature displayed a doubling of its flux density over about 10 minutes. ...

... The MIDAS Data Organizer, a customizable utility to analyze and identify associations in a database of astronomical observations, is described. ... On-line Data Reduction: . ... The main characteristics of the on-line implementation of the DO at the ESO New Technology Telescope (NTT) are described below. The database for all operations is a MIDAS (ESO-IPG 1993) table, the so-called Observation Summary Table (OST) which contains all relevant parameters extracted from the FITS keywords. ...

Peremennye Zvezdy ( Variable Stars ) 33 , No. ... The new variable star HD 305629, with a Cepheid-like light curve, is demonstrated, from our optical observations and ASAS-3 data, to actually be an ellipsoidal variable star on a highly eccentric orbit. ... During a systematic search of variable stars in the publicly available ASAS-3 database (Pojmanski 2002), apparent variability was found in the star HD 305629 (10 51 34 35, -60 47 57 4, J2000.0; Fig. ... The light curve and color curves of HD 305629. ...

... Since IRS 7 at the Galactic center was identified as a luminous red supergiant (Lebofsky et al. 1982), a lasting debate has been initiated whether the nucleus of the Milky Way galaxy had experienced a recent star formation episode. ... 1993). ... 1994). ... Tamblyn & Rieke (1993) and Schaerer (1994) proposed starburst models which would be able to account for a young stellar population at the Galactic center, although the origin of some peculiar hot stars still remains to be explained (Tamblyn et al...

... 1993: . ... Based on the results of spectrophotometric observations with a high signal-to-noise ratio of 15 blue compact galaxies with low abundances of elements heavier than helium, the origin of nitrogen in these objects was investigated. ... Based on the high-accuracy spectrophotometric observations of 10 blue compact galaxies with a low abundance of elements, the most precise value of the mass fraction of helium Y(p) was obtained. ... Archive . ...

... 205Anglada+ 0) and NH3(1,1) observations towards 172 different star forming regions (99 observed in both molecules) associated with H2O maser emission. We make a comparative study between the physical parameters obtained from the CS and NH3 spectra, and their relationship with the H2O maser emission. ... We find that both the CS and the NH3 lines are significantly wider in regions with H2O masers than in other regions. ...

... Radio searches for pulsars associated with supernova remnants. ... The Bologna submillisecond pulsar survey. ... A search for pulsar wind nebulae using pulsar gating. ... Anomalous pulsars and other radio quiet neutron stars in supernova remnants. ... A 16 ms X-ray pulsar in the Crab-like SNR N157B: fast times at 30 Doradus. ... Radio-quiet X-ray pulsars in SNRs and the ``missing'' pulsar problem. ... Searching for X-ray pulsars associated to SNRs in public ROSAT observations. ...

Spatially resolved optical spectroscopy of close companions to Herbig Ae/Be and T Tauri stars AndrИs Carmona M.E van den Acker , and Th. ... We concluded the companions are PMS stars physically associated to the primary. emission abs Ca II Li I emission absorption abs abs abs abs abs abs emi Star HD 144432 HD 100546 r [arc sec] B D B B B 4 5 1 1 1 4 .5 .1 .4 .1 .5 .1 P.A 198 156 0 236 257 312 147 V 16.4 16.8 12.7 8.7 11.6 16 12 Imaging revealed that several nearby HAeBes have close (r< 5") companions. ...

A Search for High-z Water Vapor Masers in Obscured AGNs Smita Mathur 1 , Tapasi Ghosh 2 , and Chris Salter 2 1 Ohio State University.. ... These, \megamaser" sources are mostly associated with Seyfert 2 and LINER galaxies whose active nuclei are hidden by a large column density of optically obscuring, X-ray absorbing gas (e.g. Braatz et al., 1997, ApJS, 110, 321). ... Sources out to even a Gpc will thus have detectable (mJy or greater levels) ux density in their water-maser emission. ...

Principial publication: Dement'eva A.A. and Ryl'kov V.P. The Fields of Reference Stars for Optical Positional Observations of Astrometric Extragalactic Radio Sources. ... V.9.P.127-138. to the end of the list . The starting page - The catalogues page - The list of the PUL2 fields - The list of the Pul-3(Pul-3SE) fields . Number of field . ... 0116+319 . ... 0153+744 . ... 1993.34 . ... 09 27 03.0138 . ... 73 58 01.550 . ... to the top of the list ...

... Low-latitude aurorae are a storm time phenomena, in which particles originating from the ring current (and/or which are energized by the ring current) enter the lower thermosphere causing optical emission. It has been suggested (Rassoul et al., 1993) that four "pure" types of such auroras exist, as shown in table below, where LEE = low energy electron aurora, and HP = heavy particle aurora. ... low-latitude . ... One should thus not confuse them with other red emissions from much lower altitudes. ...

... Phys., 45, 409-419 10.02.2010 , . PLHR: o 50 / 60 / 100 / 120 o MLR: o 50 / 60 / 100 / 120 o o , - PorojДrvi 17/11/1993 Total power -5 dB 1,8 -15 1,7 -25 1,6 14.09 14.11 Time(UT) -35 14.13 Frequency (kHz) 4,2 4,1 4,0 07.30 -30 -40 07.45 Time(UT) 07.00 10.02.2010 Frequency (kHz) PorojДrvi 25/01/1993 Total power 4,3 -20 dB , . ... 10.02.2010 , . ... f1 < < fn < fn+ 1 20 ms 128 Frequency (kHz) 1,8 1,8 Frequency (kHz) 4 dB 0 -20 1,7 1,7 1,6 0 10.02.2010 30 Time(sec) 60 1,6 -40 0 0,3 Time(sec) 0,6 , . ...

We review the evidence, from rotational modulation, for association of plages and spots on active binaries. ... There is a similar lack of evidence for BY Dra systems. The results can be interpreted as evidence for: (a) the presence of active longitudes which persist on some RS CVn stars for several years, (b) high filling factors in MgII emission and (c) lower filling factors, and therefore greater contrast, in SWP emission. ...

... V.G. Kurt, V.V. Sokolov, S.V. Zharikov, G.G. Pavlov, B.V. Komberg: "BVRI observations of PSR0656+14 with the 6-meter telescope" (astro-ph/9706076), 1998, A&A, 333, 547 . ... A. Shibanov, A. B. Koptsevich, V.V. Sokolov, S.V. Zharikov, G.G. Pavlov, V.G. Kurt, V.N. Komarova: "Optical photometry of the PSR B0656+14 and its neigbourhood", 2000, Abstracts of JENAM-2001, 99 . ... A. Shibanov, V.V. Sokolov, V.G. Kurt: "Optical photometry of PSR B0656+14 and its neigbourhood", 2001, A&A, 370 , 1004 . ...

Nowadays at the Department the experimental and theoretical investigations, including astronomical and ionospheric observations, active experiments with space vehicles are taking place. ... Solar Corona physics and erruptive phenomenae. ... Stellar astronomy. ... The Department has organized and put into practice more then 50 expeditions for observation of Solar ecllipces, aurorae polaris, comets, meteor streams, controlled space experiments, and also for investigations of geophysical characteristics. ...

Left: An image in the near infrared (1.65 ЮМm) around RY Tauri, using a special mode of the Subaru HiCIAO coronagraph, the polarized intensity image. This type of observation is preferred for faint emissions associated with scattered light around planet-forming disks, as there is less light from the much brighter star. ... A white ellipse shows the position of the midplane of the disk, which is observed at millimeter wavelengths. ... Right: Schematic view of the observed infrared light. ...