시작하기     To Survive in the Universe    
Inhabited Sky
    News@Sky     천체사진     컬렉션     포럼     Blog New!     질문및답변     출판     로그인  

HD 179904


내용

사진

사진 업로드

DSS Images   Other Images


관련 글

Observations of Variable Stars with the R-Coronae Phenomenon and Other Unique Objects
Not Available

UBV Photometry of the R Coronae Borealis Star RY Sgr - 1984 to 1986
Not Available

The S201 far-ultraviolet imaging survey. III - A field in Sagittarius
Far-ultraviolet imagery of a 20 deg diameter field in Sagittarius,centered near (1950) R.A. 18 h 34 m, decl. -30 deg 25 arcmin, wasobtained by the S201 far-ultraviolet camera during the Apollo 16mission. In a 10-minute exposure covering the 1250-1600 A wavelengthrange, 1034 star images are detectable, with a limiting ultravioletmagnitude of about 10. Most of these objects are identified withearly-type stars listed in the Smithsonian Astrophysical ObservatoryStar Catalog, the Catalog of Stellar Identifications, or both, but 203objects remain unidentified or are identified with late-type stars. Thephotometric measurements appear to be in reasonable agreement with thoseof the International Ultraviolet Explorer for stars in common, and withexpectations for A0 stars. A detailed photometric study was made of theMessier 8 region, and it is concluded that dust-scattered starlightcontributes about half of the total radiation observed from the centralregion of M8.

Spectra of RY SGR near minimum light
Spectra of RY Sgr were obtained near minimum light in the blue and greenranges, using the electronic camera. These spectra show a few absorptionlines and bands: the (0-0) and (1-1) Swan bands in the green wereobserved for the first time. The spectra show, moreover, two kinds ofemission lines: numerous 'narrow bright lines' and a few 'broad brightlines'. High excitation absorption lines show that at least a part ofthe photosphere remains with an essentially unchanged temperature. Thenarrow bright lines, observed in R Cr B and in the 1967 light drop of RYSgr, were ascribed by Payne-Gaposchkin (1963) to a chromosphericspectrum. The broad bright lines are slightly red-shifted lines of He Iand Ca II. An additional yellow-red photographic spectrum shows complexemission D line structures, easily separated into conspicuous narrowbright lines superposed on redshifted broad bright lines. The broadbright lines seem to be linked to the minimum phase but neither to theamplitude nor to the duration of the light drop. In a preceding lightdrop of RY Sgr in 1967, the broad bright lines are reported to be blueshifted. This behavior could be explained by some asymmetry in theejection of material.

새 글 등록


관련 링크

  • - 링크가 없습니다. -
새 링크 등록


다음 그룹에 속해있음:


관측 및 측정 데이터

별자리:궁수자리
적경:19h15m46.73s
적위:-33°31'49.7"
가시등급:7.525
거리:168.35 파섹
적경상의 고유운동:7.9
적위상의 고유운동:-10.4
B-T magnitude:7.546
V-T magnitude:7.527

천체목록:
일반명   (Edit)
HD 1989HD 179904
TYCHO-2 2000TYC 7427-1701-1
USNO-A2.0USNO-A2 0525-40272433
HIPHIP 94663

→ VizieR에서 더 많은 목록을 가져옵니다.