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

HD 86066


내용

사진

사진 업로드

DSS Images   Other Images


관련 글

Spitzer Limits on Dust Emission and Optical Gas Absorption Variability around Nearby Stars with Edge-on Circumstellar Disk Signatures
We present Spitzer infrared spectroscopic and photometric observationsand McDonald Observatory Smith Telescope and AAT high spectralresolution optical observations of four nearby stars with variable oranomalous optical absorption, likely caused by circumstellar material.The optical observations of Ca II and Na I cover a 2.8 yr baseline andextend the long-term monitoring of these systems by previousresearchers. In addition, minisurveys of the LISM around our primarytargets provide a reconstruction of the intervening LISM along the lineof sight. We confirm that the anomalous absorption detected towardα Oph is not due to circumstellar material, but to a smallfilamentary cloud <14.3 pc from the Sun. The three other primarytargets, β Car, HD 85905, and HR 10, show both short- and long-termvariability, and little of the observed absorption can be attributed tothe LISM along the line of sight. The Spitzer photometry andspectroscopy did not detect infrared excesses. For the three disk stars,we fit the maximum hypothetical infrared excess that is consistent withobserved upper limits. We place upper limits on any possible fractionalinfrared luminosity,LIR/L*<(2-5)×10-6. Thesefractional luminosities are significantly less than that found towardβ Pic but comparable to other debris disks. No stable gasabsorption component centered at the radial velocity of the star isdetected, consistent with no infrared excess detections. Based on simpleassumptions of the variable gas absorption component, we estimate limitson the circumstellar gas mass causing the variable absorption:(0.4-20)×10-8 M⊕. Thesemultiwavelength observations place strong limits on any possiblecircumstellar dust, while confirming variable circumstellar gasabsorption, and therefore are interesting targets to explore the originsand evolution of variable circumstellar gas.

새 글 등록


관련 링크

  • - 링크가 없습니다. -
새 링크 등록


다음 그룹에 속해있음:


관측 및 측정 데이터

별자리:바다뱀자리
적경:09h55m43.54s
적위:-19°40'37.5"
가시등급:7.431
거리:172.414 파섹
적경상의 고유운동:-41
적위상의 고유운동:-0.1
B-T magnitude:7.572
V-T magnitude:7.443

천체목록:
일반명   (Edit)
HD 1989HD 86066
TYCHO-2 2000TYC 6053-571-1
USNO-A2.0USNO-A2 0675-10662688
HIPHIP 48683

→ VizieR에서 더 많은 목록을 가져옵니다.