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Far Ultraviolet Spectroscopic Explorer observations of high velocity gas associated with the Monoceros Loop SNR
We present preliminary FUSE observations of high velocity (V = 65 km/s)interstellar gas seen in absorption towards HD 47420, a star lying at adistance of 1800pc in the direction of the Monoceros Loop SNR. This highvelocity component is predominantly neutral and is associated with thereceding shell of the SNR. Observations of the high ionization lines ofOVI reveal an absorption component at V = -28 km/s which can beassociated with the nearside, more ionized approaching shell of the SNR.Using supplemental IUE and ground based visible absorption data towardsHD 47420, we comment on the chemical nature of this disturbedinterstellar gas.
| Ca II H and K Filter Photometry on the UVBY System. II. The Catalog of Observations
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1995AJ....109.2828T&db_key=AST
| Photometry of Stars in the Field of R Aurigae
Not Available
| Photometry of Stars in the Field of S Persei
Not Available
| Ca II H and K filter photometry on the UVBY system. I - The standard system
A fifth filter (fwhm = 90 A) centered on Ca II H and K has beendeveloped for use with the standard uvby system. The filter, called Ca,is designed primarily for applications to metal-poor dwarfs and redgiants, regions where the uvby metallicity index, m(l), loses somesensitivity. An index, hk, is defined by replacing v in m(l) by Ca. Theeffects of interstellar extinction on the index are modeled anddemonstrated to be modest and relatively insensitive to spectral type.Observations of V, (b-y), and hk for 163 primary standards are detailedand transformed to the standard V and (b-y) system. A qualitativeanalysis using only the primary standards indicates that hk is moresensitive than m(l) over the regions of interest by about a factor of 3.
| Photospheric Absorption Lines in the Ultraviolet Spectra of O-Stars and B-Stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1990MNRAS.246..392P&db_key=AST
| Terminal velocities for a large sample of O stars, B supergiants, and Wolf-Rayet stars
It is argued that easily measured, reliable estimates of terminalvelocities for early-type stars are provided by the central velocityasymptotically approached by narrow absorption features and by theviolet limit of zero residual intensity in saturated P Cygni profiles.These estimators are used to determine terminal velocities, v(infinity),for 181 O stars, 70 early B supergiants, and 35 Wolf-Rayet stars. For OBstars, the values are typically 15-20 percent smaller than the extremeviolet edge velocities, v(edge), while for WR stars v(infinity) = 0.76v(edge) on average. New mass-loss rates for WR stars which are thermalradio emitters are given, taking into account the new terminalvelocities and recent revisions to estimates of distances and to themean nuclear mass per electron. The relationships between v(infinity),the surface escape velocities, and effective temperatures are examined.
| Large and kinematically unbiased samples of G- and K-type stars. II - Observations of evolved stars in the Bright Star sample. III - Evolved young disk stars in the Bright Star sample
Four color and RI observations were obtained for a large sample ofG-type and K-type stars in the Bright Star Catalogue. Data are firstpresented for 110 evolved stars. Photometry of evolved young diskpopulation stars have then been calibrated for luminosity, reddening,and metallicity on the basis of results for members of the Hyades andSirius superclusters. New DDO results are given for 120 stars.
| Photoelectric radial velocities. V. 69 southern HR stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972MNRAS.155..449G&db_key=AST
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Osservazione e dati astrometrici
| Costellazione: | Unicorno |
| Ascensione retta: | 06h38m20.50s |
| Declinazione: | -02°32'37.0" |
| Magnitudine apparente: | 6.14 |
| Distanza: | 226.244 parsec |
| Moto proprio RA: | -15.9 |
| Moto proprio Dec: | 5.2 |
| B-T magnitude: | 8.047 |
| V-T magnitude: | 6.289 |
Cataloghi e designazioni:
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