首页     开始     To Survive in the Universe    
Inhabited Sky
    News@Sky     天文图片     收集     论坛     Blog New!     常见问题     新闻     登录  

HD 1168


目录

图像

上传图像

DSS Images   Other Images


相关文章

Optical variability of SAO 91772: A serendipitous X-ray source
During the course of systematic observations of known or suspectedchromospherically active stars carried out at Catania AstrophysicalObservatory by a 0.8-m Automated Photometric Telescope (APT), thevariability of SAO 91772, the optical counterpart of the serendipitousX-ray source 1E0009.0+1417, was discovered. We detected aquasi-sinusoidal variation with a period of 1.84 +/- 0.02 days and aV-band peak-to-peak amplitude of about 0.08 magnitudes. The variation ofthe color indices suggests that the light change is due to photosphericcool spots, whose visibility on the projected stellar disk facing theobserver is modulated by the star rotation. Moreover, long-termvariability of the global spot covering factor is strongly suspected.

Evolved GK stars near the sun. I - The old disk population
A sample of nearly two thousand GK giants with intermediate band, (R,I),DDO and Geneva photometry has been assembled. Astrometric data is alsoavailable for most of the stars. The some 800 members of the old diskpopulation in the sample yield accurate luminosities (from two sources),reddening values and chemical abundances from calibrations of thephotometric parameters. Less than one percent of the objects arepeculiar in the sense that the flux distribution is abnormal. Thepeculiarity is signaled by strong CH (and Ba II) and weak CH. The CH+stars are all spectroscopic binaries, probably with white dwarfcompanions, whereas the CH- stars are not. A broad absorption band,centered near 3500 A, is found in the CH+ stars whereas the CH- objectshave a broad emission feature in the same region. The intensity of theseabsorptions and emissions are independent of the intensity of abnormalspectral features. Ten percent of the old disk sample have a heavyelement abundance from one and a half to three times the solar value.The distribution of the heavy element abundances is nearly a normal onewith a peak near solar abundance and ranges three times to one sixthsolar. The distribution of the (U, V) velocities is independent of theheavy element abundance and does not appear to be random. Ten percent ofthe old disk stars show a CN anomaly, equally divided between CN strongand CN weak. Several stars of individual astrometric or astrophysicalimportance are isolated.

Large and kinematically unbiased samples of G- and K-type stars. V - Evolved stars in the selected areas at + 15-deg declination
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1990PASP..102..242E&db_key=AST

Photoelectric radial velocities. IV. 528 7 to 10 mag stars in the +15degree selected areas.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971MNRAS.155....1G&db_key=AST

提交文章


相关链接

  • - 没有找到链接 -
提交链接


下列团体成员


观测天体数据

星座:雙魚座
右阿森松:00h16m02.05s
赤纬:+14°42'26.3"
视星:8.382
距离:197.239 天文距离
右阿森松适当运动:68.6
赤纬适当运动:-15.7
B-T magnitude:10.115
V-T magnitude:8.526

目录:
适当名称   (Edit)
HD 1989HD 1168
TYCHO-2 2000TYC 601-397-1
USNO-A2.0USNO-A2 0975-00056268
HIPHIP 1277

→ 要求更多目录从vizier