Cold dust in three massive evolved stars in the LMC

Boyer, Martha L.; Sargent, Benjamin; Loon, Jacco Th. van; Srinivasan, S.; Clayton, Geoffrey C.; Kemper, F.; Smith, L. J.; Matsuura, M.; Woods, Paul; Marengo, Massimo; Meixner, Margaret; Engelbracht, C. W.; Gordon, K. D.; Hony, S.; Indebetouw, R.; Misselt, K. A.; Okumura, K.; Panuzzo, P.; Riebel, D.; Roman-Duval, Julia; Sauvage, M.; Sloan, G. C.

doi:10.1051/0004-6361/201014513

Cited by 26 publications

(39 citation statements)

References 51 publications

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“…We do not use the PACS data for analysis in this paper, but anticipate that with cross-scans the PACS data will be viable for an extended map of the diffuse ISM. Nevertheless, the destriping was effective for small regions (Otsuka et al 2010) and revealing point sources (Sewiło et al 2010;Boyer et al 2010).…”

Section: Pacs Data Reductionmentioning

confidence: 99%

“…2) is fit with a comprehensive dust radiation model described in detail by Galametz et al (2009). We adopt the Dale & Helou (2002;Eq. (1)) prescription, relating the dust mass to the integrated energy density to which it is exposed in units of the solar neighborhood intensity (2.2 × 10 −5 W m −2 ; Mathis et al 1983). The standard model (model 1) we apply on the strip uses the Galactic ISM dust size distribution and composition of graphite and silicate grains from Zubko et al (2004;BARE-GR-S model) who successfully fit the Galactic ISM dust emission out to submillimeter wavelengths.…”

Section: Spectral Energy Distribution Of the Stripmentioning

confidence: 99%

“…During the science demonstration phase (SDP), we imaged a long strip across the LMC that covers the entire range of interesting objects we expect to study with HERITAGE: giant molecular and diffuse H I clouds (Roman-Duval et al 2010;Kim et al 2010), H II regions , young stellar objects (Sewiło et al 2010), supernova remnants (Otsuka et al 2010), and evolved stars (Boyer et al 2010). In this paper, we present the observing strategy, processing and resulting data set (Sect.…”

Section: Introductionmentioning

confidence: 99%

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HERschelInventory of The Agents of Galaxy Evolution (HERITAGE): The Large Magellanic Cloud dust

Meixner

Galliano

Hony

et al. 2010

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The HERschel Inventory of The Agents of Galaxy Evolution (HERITAGE) of the Magellanic Clouds will use dust emission to investigate the life cycle of matter in both the Large and Small Magellanic Clouds (LMC and SMC). Using the Herschel Space Observatory's PACS and SPIRE photometry cameras, we imaged a 2 • × 8 • strip through the LMC, at a position angle of ∼22.5 • as part of the science demonstration phase of the Herschel mission. We present the data in all 5 Herschel bands: PACS 100 and 160 μm and SPIRE 250, 350 and 500 μm. We present two dust models that both adequately fit the spectral energy distribution for the entire strip and both reveal that the SPIRE 500 μm emission is in excess of the models by ∼6 to 17%. The SPIRE emission follows the distribution of the dust mass, which is derived from the model. The PAH-to-dust mass ( f PAH ) image of the strip reveals a possible enhancement in the LMC bar in agreement with previous work. We compare the gas mass distribution derived from the HI 21 cm and CO J = 1−0 line emission maps to the dust mass map from the models and derive gas-to-dust mass ratios (GDRs). The dust model, which uses the standard graphite and silicate optical properties for Galactic dust, has a very low GDR = 65 +15 −18making it an unrealistic dust model for the LMC. Our second dust model, which uses amorphous carbon instead of graphite, has a flatter emissivity index in the submillimeter and results in a GDR = 287 +25 −42 that is more consistent with a GDR inferred from extinction.

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Section: Pacs Data Reductionmentioning

confidence: 99%

Section: Spectral Energy Distribution Of the Stripmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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HERschelInventory of The Agents of Galaxy Evolution (HERITAGE): The Large Magellanic Cloud dust

Meixner

Galliano

Hony

et al. 2010

A&A

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“…The primary target, IRAS 05280−6910 was chosen because it is the brightest LMC RSG at far-infrared wavelengths (Boyer et al 2010), with the 250 µm flux of 205 mJy. The submillimeter spectrum of IRAS 05280−6910 was obtained, using the SPIRE Fourier Transform spectrometer (Griffin et al 2010;Swinyard et al 2010) on board the Herschel Space Observatory.…”

Section: Observations and Analysismentioning

confidence: 99%

Detection of rotational CO emission from the red-supergiants in the Large Magellanic Cloud

et al. 2015

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Detection of Rotational CO Emission From the Red-supergiants in the Large General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Abstract.It is yet well understood how mass-loss rates from evolved stars depend on metallicities. With a half of the solar metallicity and the distance of only 50 kpc, the evolved stars of the Large Magellanic Cloud (LMC) are an ideal target for studying mass loss at low metallicity. We have obtained spectra of red-supergiants in the LMC, using the Hershel Space Observatory, detecting CO thermal lines fro J=6-5 up to 15-14 lines. Modelling CO lines with non-LTE Radiative transfer code suggests that CO lines intensities can be well explained with high gas-to-dust ratio, with no obvious reduction in mass-loss rate at the LMC. We conclude that the luminosities of the stars are dominant factors on mass-loss rates, rather than the metallicity.

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“…Evolved stellar envelopes lack cold dust, peak in the mid-IR, and are few among Herschel sources. We removed one from Boyer et al (2010), leaving 207 sources in our very conservative list. Figure 1 shows a color-magnitude diagram of our 207 YSO candidates, combining Spitzer (70 μm) with Herschel (160 and 250 μm) bands.…”

Section: Introductionmentioning

confidence: 99%

The youngest massive protostars in the Large Magellanic Cloud

Sewiło¹,

Indebetouw

Carlson

et al. 2010

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We demonstrate the unique capabilities of Herschel to study very young luminous extragalactic young stellar objects (YSOs) by analyzing a central strip of the Large Magellanic Cloud obtained through the HERITAGE science demonstration program. We combine PACS 100 and 160, and SPIRE 250, 350, and 500 μm photometry with 2MASS (1.25-2.17 μm) and Spitzer IRAC and MIPS (3.6-70 μm) to construct complete spectral energy distributions (SEDs) of compact sources. From these, we identify 207 candidate embedded YSOs in the observed region, ∼40% never-before identified. We discuss their position in far-infrared color-magnitude space, comparing with previously studied, spectroscopically confirmed YSOs and maser emission. All have red colors indicating massive cool envelopes and great youth. We analyze four example YSOs, determining their physical properties by fitting their SEDs with radiative transfer models. Fitting full SEDs including the Herschel data requires us to increase the size and mass of envelopes included in the models. This implies higher accretion rates ( 10 −4 M yr −1 ), in agreement with previous outflow studies of high-mass protostars. Our results show that Herschel provides reliable longwave SEDs of large samples of high-mass YSOs; discovers the youngest YSOs whose SEDs peak in Herschel bands; and constrains the physical properties and evolutionary stages of YSOs more precisely than was previously possible.

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Cold dust in three massive evolved stars in the LMC

Cited by 26 publications

References 51 publications

HERschelInventory of The Agents of Galaxy Evolution (HERITAGE): The Large Magellanic Cloud dust

HERschelInventory of The Agents of Galaxy Evolution (HERITAGE): The Large Magellanic Cloud dust

Detection of rotational CO emission from the red-supergiants in the Large Magellanic Cloud

The youngest massive protostars in the Large Magellanic Cloud

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