Spectra of stars in cometary nebulas

Dibai, E. A.

doi:10.1007/bf01013047

Cited by 5 publications

(7 citation statements)

References 12 publications

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“…In addition, one of the Post-AGB stars from Peeters et al (2002) and also HD 56126, a Post-AGB star with PAH and silicate emission (Hony et al 2003), have the same spectral type as Parsamian 21. However, we should mention that Dibai (1969) and The et al (1994) give a spectral type of A5Veα for Parsamian 21. This is too early for a typical FU Orionis object, but could also explain the PAH emission.…”

Section: Parsamian 21 -Intermediate Mass Fuor or Post-agb Star?mentioning

confidence: 76%

Evolution of Dust and Ice Features around FU Orionis Objects

Quanz

Henning

Bouwman

et al. 2007

ApJ

129

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We present spectroscopy data for a sample of 14 FUors and 2 TTauri stars observed with the Spitzer Space Telescope or with the Infrared Space Observatory (ISO). Based on the appearance of the 10 µm silicate feature we define 2 categories of FUors. Objects showing the silicate feature in absorption (Category 1) are still embedded in a dusty and icy envelope. The shape of the 10 µm silicate absorption bands is compared to typical dust compositions of the interstellar medium and found to be in general agreement. Only one object (RNO 1B) appears to be too rich in amorphous pyroxene dust, but a superposed emission feature can explain the observed shape. We derive optical depths and 1 The ISO archive can be accessed via

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Section: Parsamian 21 -Intermediate Mass Fuor or Post-agb Star?mentioning

confidence: 76%

Evolution of Dust and Ice Features around FU Orionis Objects

Quanz

Henning

Bouwman

et al. 2007

ApJ

129

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“…This object lies in the southern part of the nebula NGC 1931. Dibai (1969) provides UBV data on the star, V = 11^4, (B-V) = (T88, (U-B) = 0^72, and a spectral type of B2. It would seem to be merely a reddened, normal B star.…”

Section: Notes On Individual Objectsmentioning

confidence: 99%

“…Cometary nebulae fall into four morphological subsets. These encompass (Dibai 1970) I. arcuate structures (e.g., the incomplete rings near T Tau and Lk Ha-120); II. conical or fan nebulae (prototype NGC 2261); III.…”

Section: Introductionmentioning

confidence: 99%

Infrared Observations of New Cometary Nebulae

Cohen¹

1974

PASP

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An infrared photometric survey of small nebulae selected from the Palomar Sky Survey prints reveals that long wavelength radiation 10 f¿) is only detected from those objects with "cometary" morphology. The structure of the nebulae and the infrared properties of their associated stars suggest that cometary nebulae are young stars surrounded by a disk-like distribution of dust, which may be viewed at various inclinations.

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“…A study by Yoshida et al (1992) has revised MWC 1080's spectral type to A0-A3 and luminosity class Ib-II. Several other authors have also suggested a later spectral type; Dibai (1969) classifies the star as a late B or early A type, and Cantó et al (1984) suggest a spectral type similar to that of R Mon (A5). Published distances range from 211 to 2500 pc depending on assumptions made concerning the visual extinction and the spectral type (Canto et al 1984;Pezzuto, Strafella, & Lorenzetti 1997).…”

Section: Mwc 1080mentioning

confidence: 99%

The Dusty Circumstellar Environments of A[CLC]e[/CLC]/B[CLC]e[/CLC] Protoplanetary Disk Candidates

Polomski

Telesco

Piña

et al. 2002

The Astronomical Journal

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We have obtained high spatial resolution mid-IR observations of four intermediate-mass pre-mainsequence stars: HD 259431, AS 310, LkH 234, and MWC 1080. Our observations reveal the morphology of the circumstellar (500-10,000 AU) environments of these young stars. We resolve companion stars and complex diffuse emission from dust that can account for on average 50% of the IR emission detected in previous low-resolution observations. We calculate new spectral indices for these objects and show that they differ from those expected from simple geometrically flat disk models. We also show mid-IR spectral energy distributions that reveal the presence of silicate emission and absorption features for several objects. Finally, temperature maps constructed from our observations suggest the presence of transiently heated grains, and optical depth maps point to the locations of the most embedded objects.

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Spectra of stars in cometary nebulas

Cited by 5 publications

References 12 publications

Evolution of Dust and Ice Features around FU Orionis Objects

Evolution of Dust and Ice Features around FU Orionis Objects

Infrared Observations of New Cometary Nebulae

The Dusty Circumstellar Environments of A[CLC]e[/CLC]/B[CLC]e[/CLC] Protoplanetary Disk Candidates

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