בית     התחל מכאן     To Survive in the Universe    
Inhabited Sky
    News@Sky     תמונת אסטרו     האוסף     קבוצת דיון     Blog New!     שאלות נפוצות     עיתונות     כניסה  

HD 112815


תוכן

תמונות

הוסף תמונה שלך

DSS Images   Other Images


מאמרים קשורים

The Vienna-KPNO search for Doppler-imaging candidate stars. I. A catalog of stellar-activity indicators for 1058 late-type Hipparcos stars
We present the results from a spectroscopic Ca ii H&K survey of 1058late-type stars selected from a color-limited subsample of the Hipparcoscatalog. Out of these 1058 stars, 371 stars were found to showsignificant H&K emission, most of them previously unknown; 23% withstrong emission, 36% with moderate emission, and 41% with weak emission.These spectra are used to determine absolute H&K emission-linefluxes, radial velocities, and equivalent widths of theluminosity-sensitive Sr ii line at 4077 Ä. Red-wavelengthspectroscopic and Strömgren y photometric follow-up observations ofthe 371 stars with H&K emission are used to additionally determinethe absolute Hα -core flux, the lithium abundance from the Li i6708 Å equivalent width, the rotational velocity vsin i, theradial velocity, and the light variations and its periodicity. Thelatter is interpreted as the stellar rotation period due to aninhomogeneous surface brightness distribution. 156 stars were found withphotometric periods between 0.29 and 64 days, 11 additional systemsshowed quasi-periodic variations possibly in excess of ~50 days. Further54 stars had variations but no unique period was found, and four starswere essentially constant. Altogether, 170 new variable stars werediscovered. Additionally, we found 17 new SB1 (plus 16 new candidates)and 19 new SB2 systems, as well as one definite and two possible new SB3systems. Finally, we present a list of 21 stars that we think are mostsuitable candidates for a detailed study with the Doppler-imagingtechnique. Tables A1--A3 are only available in electronic form at theCDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html

A second list of wide visual binaries
Not Available

A second list of wide visual binaries
Not Available

Balmer Discontinuities of Chemically Peculiar Stars
Not Available

Visual multiples. VII - MK classifications
Classifications are given for 865 components of visual multiples; theyshow no systematic differences from the MK system, and the random errorsare one subclass in type and two-thirds of a luminosity class. It isfound that at least 1% of the F-type IV and V stars are weak-lined, 32%of the A4-F1 IV and V stars are Am, and 5% of the A0-A3 IV and V starsare early-type Am. Attention is called to the large fraction (55%) ofthe A3-A9 III-V stars that are of luminosity classes III or IV, unlikethe percentage (16%) at neighboring types.

הכנס מאמר חדש


לינקים קשורים

  • - לא נמצאו לינקים -
הכנס לינק חדש


משמש של הקבוצה הבאה


תצפית ומידע אסטרומטרי

קבוצת-כוכבים:בתולה
התרוממות ימנית:12h59m20.16s
סירוב:+06°30'21.1"
גודל גלוי:7.543
מרחק:88.339 פארסק
תנועה נכונה:-24.4
תנועה נכונה:-15.3
B-T magnitude:8.64
V-T magnitude:7.634

קטלוגים וכינוים:
שם עצם פרטי   (Edit)
HD 1989HD 112815
TYCHO-2 2000TYC 297-11-1
USNO-A2.0USNO-A2 0900-07281302
HIPHIP 63386

→ הזמן עוד קטלוגים וכינוים מוזיר