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IC 2169 (Dreyer's Nebula)



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New magnetic chemically peculiar stars
Spectropolarimetric observations of 96 chemically peculiar (CP)main-sequence stars have been carried out at the 6-m telescope at theSpecial Astrophysical Observatory of the Russian Academy of Sciences(SAO RAS) with the aim of searching for the presence of stellar magneticfields. The stars selected for investigation were CP stars known to havestrong anomalies in the wavelength region of the continuum fluxdepression around λ 5200Å. This selection was conductedwith the aid of low-resolution spectral observations, made with the SAORAS 1-m telescope, and of published differential photometric data.Magnetic fields have been successfully detected in 72 stars of whichonly three stars were previously known to have magnetic fields. For twostars, the longitudinal component of the magnetic field Beexceeds 5 kG: HD178892 - 7.4 kG, and HD258686 - 6.7 kG. We failed toreliably detect the magnetic field in the other 24 CP stars. These starsare mostly fast rotators, a feature which hampers accurate measurementsof Be. It is demonstrated in this paper that selectingcandidate magnetic stars by considering their photometric indices Z orΔa, or alternatively, by inspecting low-resolution spectra aroundthe λ5200Å flux depression, considerably increases thedetection rate.This paper is based on data obtained at the 6-m telescope of the RussianAcademy of Sciences.E-mail: dkudr@sao.ru

Merged catalogue of reflection nebulae
Several catalogues of reflection nebulae are merged to create a uniformcatalogue of 913 objects. It contains revised coordinates,cross-identifications of nebulae and stars, as well as identificationswith IRAS point sources.The catalogue is only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr ( or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/399/141

A Correlation between the Distributions of Pulsars and Emission Measures in the Galaxy
A correlation has been detected between the volume density of pulsarsand the density of interstellar ionized gas on scales of more than 500pc in Galactic longitude and 200 pc in Galactic latitude. On smallerscales, the correlation is present only for pulsars with ages less than60000 years, which are located predominantly near supernova remnants andH II regions. This all indicates that pulsars are born in regions withhigh concentrations of interstellar gas. The minimum emission measuresobserved in the directions toward pulsars are inversely proportional tothe pulsar ages. It is concluded that the ionized gas in the vicinitiesof a number of pulsars was formed during supernova explosions, andcorresponds to Strömgren zones. The ionization of the gas in thesezones requires a radiation energy on the order of 1050 1051 erg.

Discovery of Three Radio Pulsars from an X-Ray--selected Sample
Abstract image available at:http://adsabs.harvard.edu/abs/1996ApJ...456..305Z

The structure of star formation regions. II - Studies of certain regions - RSF 3 MON
Photoelectric UBVR photometry and a spectral classification were carriedout for more than 100 stars associated with the nebulae NGC 2245-2247,IC 446, IC 2169, and the cluster Cr 95 in the western part of RSF 3 Mon.The stars associated with these nebulae, the cluster Cr 95, NGC 2264,and hot field stars represent a single star formation region. The age ofRSF 3 Mon exceeds 20 Myr.

A catalogue of bright nebulosities in opaque dust clouds
Abstract image available at:http://adsabs.harvard.edu/abs/1977A&AS...29...65B

CO observations of galactic reflection nebulae
Carbon monoxide emission has been observed toward about 35 galacticreflection nebulae. The peaking of CO temperatures near the hotter starsindicates substantial local heating of the gas and dust by the embeddedstars. Wide low-level emission wings are seen on several of the (C-12)Oline profiles; these are most plausibly interpreted as due to cloudmaterial accelerated by such processes as radiation pressure from thenewborn stars.

Radio Emission from Small Galactic Nebulae at 606 MHz
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972AJ.....77..115T&db_key=AST

Ricerche sulle associazioni T, Nota III: Variabili nebulari nella zona di IC 2169
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Untersuchungen über Reflexionsnebel am Palomar Sky Survey I. Verzeichnis von Reflexionsnebeln
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TThe source of luminosity in galactic nebulae.
Not Available

A general study of diffuse galactic nebulae.
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Observation and Astrometry data

Right ascension:06h31m00.00s
Apparent magnitude:99.9

Catalogs and designations:
Proper NamesDreyer's Nebula
ICIC 2169

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