Infrared emission from dust structures surrounding Herbig Ae/Be stars

Berrilli, F.; Corciulo, G.; Ingrosso, G.; Lorenzetti, D.; Nisini, B.; Strafella, F.

doi:10.1086/171853

Cited by 120 publications

(102 citation statements)

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“…HD 259431's mid-IR SED falls toward longer wavelengths, with a 3-10 lm spectral index of 0.34, very similar to that expected from a moderately flared disk. Previous mid-IR photometry of AS 310 by Cohen (1974) with an 11 00 aperture shows a silicate emission feature, but more recent observations by Berrilli et al (1992) with a 15 00 aperture indicate a blackbody spectrum. Our data show a silicate emission feature at 10 lm and the suggestion of an additional feature at 18 lm (Fig.…”

Section: No 4 2002mentioning

confidence: 89%

“…Mid-IR observations show an emission feature at 10 lm from silicate grains (Cohen 1974; 10 00 aperture). However, more recent observations by Berrilli et al (1992; 15 00 aperture) indicate a featureless spectrum.…”

Section: As 310mentioning

confidence: 94%

“…Ground-based mid-IR observations of HD 259431 show an excess of up to 6 mag and a smooth featureless SED (Sitko 1981). However, IRAS spectroscopy and ground-based observations by Berrilli et al (1992) have indicated a 10 lm silicate absorption feature. No such feature is present in higher spatial resolution ground-based spectra (Wooden 1994).…”

Section: Hd 259431mentioning

confidence: 99%

“…The mid-IR SED shows a silicate emission feature. Previous researchers cited an absorption feature (Berrilli et al 1992) or a flat spectrum for HD 259431 (Sitko 1981); this may be an effect of aperture size. Large apertures include emission from the dusty envelopes as well as from the circumstellar regions of these stars.…”

Section: No 4 2002mentioning

confidence: 99%

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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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Section: No 4 2002mentioning

confidence: 89%

Section: As 310mentioning

confidence: 94%

Section: Hd 259431mentioning

confidence: 99%

Section: No 4 2002mentioning

confidence: 99%

See 2 more Smart Citations

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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“…In x 2 of the paper we describe our sample. Spectroscopic observations obtained are presented in Baines et al 2004;(18) Malfait et al 1998;(19) Acke et al 2005;(20) Testi et al 1998;(21) van den Ancker et al 2004;(22) Corcoran & Ray 1998;(23) Miroshnichenko et al 2001b;(24) Alencar et al 2003;(25) Hamaguchi et al 2005;(26) Terranegra et al 1994;(27) van den Ancker et al 1998;(28) Berrilli et al 1992;(29) Perryman et al 1997;(30) Calvet et al 2004;(31) Leinert et al 1997;(32) Kawamura et al 1998;(33) Hernández et al 2005;(34) Herbst & Racine 1976;(35) Herbst et al 1982;(36) Shevchenko et al 1999;(37) Leinert et al 2004;(38) Eisner et al 2004;(39) Shevchenko & Yakubov 1989. x 3. Main results of our study are presented in x 4 and discussed in detail in x 5.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Emission‐Line Activity in Intermediate‐Mass Young Stars

Manoj

Bhatt

Maheswar

et al. 2006

ApJ

140

139

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We present optical spectra of 45 intermediate-mass Herbig Ae/ Be stars. Together with the multiepoch spectroscopic and photometric data compiled for a large sample of these stars and ages estimated for individual stars by using preYmain-sequence evolutionary tracks, we have studied the evolution of emission-line activity in them. We find that, on average, the H emission line strength decreases with increasing stellar age in Herbig Ae/ Be stars, indicating that the accretion activity gradually declines during the preYmain-sequence phase. This would hint at a relatively longlived (a few Myr) process being responsible for the cessation of accretion in Herbig Ae/ Be stars. We also find that the accretion activity in these stars drops substantially by $3 Myr. This is comparable to the timescale in which most intermediate-mass stars are thought to lose their inner disks, suggesting that inner disks in intermediate-mass stars are dissipated rapidly after the accretion activity has fallen below a certain level. We further find a relatively tight correlation between strength of the emission line and near-infrared excess due to inner disks in Herbig Ae/ Be stars, indicating that the disks around Herbig Ae/ Be stars cannot be entirely passive. We suggest that this correlation can be understood within the framework of the puffed-up inner rim disk models if the radiation from the accretion shock is also responsible for the disk heating.

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