Home     Getting Started     To Survive in the Universe    
Inhabited Sky
    News@Sky     Astro Photo     The Collection     Forum     Blog New!     FAQ     Press     Login  

HD 171236


Contents

Images

Upload your image

DSS Images   Other Images


Related articles

Few Skewed Disks Found in First Closure-Phase Survey of Herbig Ae/Be Stars
Using the three-telescope IOTA interferometer on Mount Hopkins, wereport results from the first near-infrared (λ=1.65 μm)closure-phase survey of young stellar objects (YSOs). These closurephases allow us to unambiguously detect departures from centrosymmetry(i.e., skew) in the emission pattern from YSO disks on the scale of ~4mas, expected from generic ``flared disk'' models. Six of 14 targetsshowed small, yet statistically significant nonzero closure phases, withlargest values from the young binary system MWC 361-A and the(pre-main-sequence?) Be star HD 45677. Our observations are quitesensitive to the vertical structure of the inner disk, and we confrontthe predictions of the ``puffed-up inner wall'' models of Dullemond,Dominik, & Natta (DDN). Our data support disk models with curvedinner rims because the expected emission appears symmetricallydistributed around the star over a wide range of inclination angles. Incontrast, our results are incompatible with the models possessingvertical inner walls because they predict extreme skewness (i.e., largeclosure phases) from the near-IR disk emission that is not seen in ourdata. In addition, we also present the discovery of mysterious H-band``halos'' (~5%-10% of light on scales 0.01"-0.50") around a few objects,a preliminary ``parametric imaging'' study for HD 45677, and the firstastrometric orbit for the young binary MWC 361-A.

On Two 1978 Novae - Nova Sagittarius 1978 = V3876-SAGITTARIUS and Nova Cygni 1978 = V1668-CYGNI
Not Available

Submit a new article


Related links

  • - No Links Found -
Submit a new link


Member of following groups:


Observation and Astrometry data

Constellation:Sagittaire
Right ascension:18h34m25.33s
Declination:-19°47'04.8"
Apparent magnitude:7.18
Distance:245.098 parsecs
Proper motion RA:32.7
Proper motion Dec:-18.9
B-T magnitude:8.974
V-T magnitude:7.329

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 171236
TYCHO-2 2000TYC 6275-795-1
USNO-A2.0USNO-A2 0675-27286473
HIPHIP 91051

→ Request more catalogs and designations from VizieR