To Survive in the Universe    
Services
    Why to Adopt     Top Contributors     천체사진     컬렉션     포럼     Blog New!     질문및답변     로그인  
→ Adopt this star  

HD 142209


내용

사진

사진 업로드

DSS Images   Other Images


관련 글

Diffraction-limited speckle interferometry and modeling of the circumstellar envelope of R CrB at maximum and minimum light
We present the first speckle interferometric observations of RCrB, the prototype of a class of peculiar stars which undergoirregular declines in their visible light curves. The observations werecarried out with the 6 m telescope at the Special AstrophysicalObservatory near maximum light (V=7, 1996 Oct. 1) and at minimum light(V=10.61, 1999 Sep. 28). A spatial resolution of 75 mas was achieved inthe K-band. The dust shell around R CrB is partially resolved, and thevisibility is approximately 0.8 at a spatial frequency of 10cycles/arcsec. The two-dimensional power spectra obtained at both epochsdo not show any significant deviation from circular symmetry. Thevisibility function and spectral energy distribution obtained nearmaximum light can be simultaneously fitted with a model consisting ofthe central star and an optically thin dust shell with densityproportional to r-2. The inner boundary of the shell is foundto be 82 Rstar (19 mas) with a temperature of 920 K.However, this simple model fails to simultaneously reproduce thevisibility and spectral energy distribution obtained at minimum light.We show that this discrepancy can be attributed to thermal emission froma newly formed dust cloud.

Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Subtittle: Radial velocities: The Wilson-Evans-Batten catalogue.
We give a common version of the two catalogues of Mean Radial Velocitiesby Wilson (1963) and Evans (1978) to which we have added the catalogueof spectroscopic binary systems (Batten et al. 1989). For each star,when possible, we give: 1) an acronym to enter SIMBAD (Set ofIdentifications Measurements and Bibliography for Astronomical Data) ofthe CDS (Centre de Donnees Astronomiques de Strasbourg). 2) the numberHIC of the HIPPARCOS catalogue (Turon 1992). 3) the CCDM number(Catalogue des Composantes des etoiles Doubles et Multiples) byDommanget & Nys (1994). For the cluster stars, a precise study hasbeen done, on the identificator numbers. Numerous remarks point out theproblems we have had to deal with.

Accuracy of two-dimensional spectral classes derived through DDO photometry.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1977AJ.....82..832Y&db_key=AST

새 글 등록


관련 링크

  • - 링크가 없습니다. -
새 링크 등록


다음 그룹에 속해있음:


관측 및 측정 데이터

별자리:북쪽왕관자리
적경:15h52m21.51s
적위:+28°36'26.6"
가시등급:7.921
거리:174.216 파섹
적경상의 고유운동:-11.1
적위상의 고유운동:22.8
B-T magnitude:9.537
V-T magnitude:8.055

천체목록:
일반명
HD 1989HD 142209
TYCHO-2 2000TYC 2040-558-1
USNO-A2.0USNO-A2 1125-07413099
HIPHIP 77743

→ VizieR에서 더 많은 목록을 가져옵니다.