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תמונות
הוסף תמונה שלך
DSS Images Other Images
מאמרים קשורים
ADONIS observations of the HD 100546 circumstellar dust disk
We report in this letter the first resolved images of the circumstellardust disk around the Pre-Main-Sequence star HD 100546. Thesenear-infrared images were obtained in J and short K bands with theadaptive optics system ADONIS at the ESO observatory. A bright diskextending 2 arcsec (200 AU) far from the star and viewed with aninclination with respect to the line of sight around 50 degrees isrevealed by the observations. Using a simplified model of lightscattering, we find that the dust disk density peaks at a distance of 40AU from the star, and the FWHM of this dense ring is typically 20 AU.This type of disk is believed to be a denser precursor of betaPictoris-like main-sequence disks. The structure of the disk is comparedwith the best known example of the class of ``debris disks'', the disksurrounding beta Pictoris. based on observations collected on the ESO3.6m telescope at La Silla, proposal 63.H-0239}
| A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association
B- and A-type stars in and near the Sco-Cen OB association areinvestigated with UBV and H-beta photometry to acquire data relevant tothe luminosity function of Sco-Cen. The measurements generally consistof two 10-s integrations of U, B, V, (W, N) filters, and theobservations are corrected iteratively for atmospheric extinction andinstrumental response. The data presented give the mean V magnitude,mean B-V, mean U-B, and the estimated uncertainties for these values.The catalog provides a homogeneous catalog of data for a large fieldwith stellar objects delineating membership to the association Sco-Cenand that affect the luminosity function of the aggregate.
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הכנס מאמר חדש
לינקים קשורים
הכנס לינק חדש
משמש של הקבוצה הבאה
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | זבוב |
| התרוממות ימנית: | 11h41m42.36s |
| סירוב: | -71°30'22.9" |
| גודל גלוי: | 7.963 |
| מרחק: | 202.02 פארסק |
| תנועה נכונה: | -17.7 |
| תנועה נכונה: | 3.9 |
| B-T magnitude: | 8.102 |
| V-T magnitude: | 7.975 |
קטלוגים וכינוים:
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