Poчetna     Да почнемо     To Survive in the Universe    
Inhabited Sky
    News@Sky     Астро Фотографије     Колекција     Форум     Blog New!     FAQ(Често постављана питања     Штампа     Улогуј се  

HD 61950


Садржај

Слике

Уплоадјуј своје слике

DSS Images   Other Images


Везани чланци

Optical, infrared and millimetre-wave properties of Vega-like systems - IV. Observations of a new sample of candidate Vega-like sources
Photometric observations at optical and near-infrared wavelengths arepresented for members of a new sample of candidate Vega-like systems, ormain sequence stars with excess infrared emission due to circumstellardust. The observations are combined with IRAS fluxes to define thespectral energy distributions of the sources. Most of the sources showonly photospheric emission at near-IR wavelengths, indicating a lack ofhot (~1000K) dust. Mid-infrared spectra are presented for four sourcesfrom the sample. One of them, HD 150193, shows strong silicate emission,while another, HD 176363, was not detected. The spectra of two starsfrom our previous sample of Vega-like sources both show UIR-bandemission, attributed to hydrocarbon materials. Detailed comparisons ofthe optical and IRAS positions suggest that in some cases the IRASsource is not physically associated with the visible star. Alternativeassociations are suggested for several of these sources. Fractionalexcess luminosities are derived from the observed spectral energydistributions. The values found are comparable to those measuredpreviously for other Vega-like sources.

Candidate Main-Sequence Stars with Debris Disks: A New Sample of Vega-like Sources
Vega-like sources are main-sequence stars that exhibit IR fluxes inexcess of expectations for stellar photospheres, most likely due toreradiation of stellar emission intercepted by orbiting dust grains. Wehave identified a large sample of main-sequence stars with possibleexcess IR radiation by cross-correlating the Michigan Catalog ofTwo-dimensional Spectral Types for the HD Stars with the IRAS FaintSource Survey Catalog. Some 60 of these Vega-like sources were not foundduring previous surveys of the IRAS database, the majority of whichemployed the lower sensitivity Point Source Catalog. Here, we providedetails of our search strategy, together with a preliminary examinationof the full sample of Vega-like sources.

Додај нови чланак


Линкови у сродству са темом

  • - Нема линкова -
Додај нови линк


Чланови следећих група \:


Посматрања и Астрометриски подаци

Сазвежђа:Летећа риба
Ректацензија:07h36m19.26s
Deклинација:-69°03'23.5"
Apparent магнитуда:6.869
Даљина:362.319 parsecs
Proper motion RA:-6.1
Proper motion Dec:14.9
B-T magnitude:6.844
V-T magnitude:6.867

Каталог и designations:
Proper имена   (Edit)
HD 1989HD 61950
TYCHO-2 2000TYC 9180-168-1
USNO-A2.0USNO-A2 0150-04904826
HIPHIP 37007

→ Захтевај још каталога од VizieR