Millimeter and Submillimeter Survey of the R Coronae Australis Region

Groppi, Christopher; Kulesa, Craig; Walker, Christopher K.; Martin, Christopher L.

doi:10.1086/422168

Cited by 21 publications

(40 citation statements)

References 23 publications

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“…Nevertheless, it is likely that WBM 55 also drives an outflow. However, we do not see any dust emission from IRS 7, which has been suggested as a possible candidate for driving the large scale CO outflow (Levreault 1988;Groppi et al 2004a;Wilking et al 1997). IRS 7 is deeply embedded (A V > 35 0 ) in the cloud core and appears as a nebulous knot in the K band.…”

Section: Scuba 450 and 850 M Resultscontrasting

confidence: 56%

“…Figure 5 shows the CO outflow solid and dashed contours. The velocity intervals used to produce the solid and dashed contours are similar to Groppi et al (2004a) at À10 to +3 km s À1 for the blue wing, and 10 Y21 km s À1 for the red wing. These data provide about 3 times the spatial resolution of Groppi et al (2004a) and confirm that the center of the outflow is in the vicinity of IRS 7.…”

Section: Co Outflowsmentioning

confidence: 99%

“…The velocity intervals used to produce the solid and dashed contours are similar to Groppi et al (2004a) at À10 to +3 km s À1 for the blue wing, and 10 Y21 km s À1 for the red wing. These data provide about 3 times the spatial resolution of Groppi et al (2004a) and confirm that the center of the outflow is in the vicinity of IRS 7. Even with this spatial resolution the CO map gives the appearance that the high velocity emission is dominated by a single outflow centered near IRS 7 and SMA 2.…”

Section: Co Outflowsmentioning

confidence: 99%

“…While images with the Chandra X-ray Observatory and the VLA have been able to resolve individual sources in the R CrA region, work in the (sub)millimeter band has been limited to single-dish telescopes with >20 00 resolution. Nevertheless, the proximity of R CrA has allowed even moderate resolution studies to reveal (sub)millimeter sources in the region that have no near-IR counterparts (Chini et al 2003;Groppi et al 2004a;Schöier et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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High Spatial Resolution Observations of Two Young Protostars in the R Corona Australis Region

Groppi

Hunter

Blundell

et al. 2007

ApJ

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112

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We present multiwavelength, high spatial resolution imaging of the IRS 7 region in the R Corona Australis molecular cloud. Our observations include 1.1 mm continuum and HCO + J ¼ 3 ! 2 images from the Submillimeter Array (SMA), 12 CO J ¼ 3 ! 2 outflow maps from the DesertStar heterodyne array receiver on the Heinrich Hertz Telescope (HHT), 450 and 850 m continuum images from SCUBA, and archival Spitzer IRAC and MIPS 24 m images. The accurate astrometry of the IRAC images allow us to identify IRS 7 with the centimeter source VLA 10W (IRS 7A) and the X-ray source X W . The SMA 1.1 mm image reveals two compact continuum sources that are also distinguishable at 450 m. SMA 1 coincides with X-ray source CXOU J190156.4À365728 and VLA centimeter source 10E (IRS 7B) and is seen in the IRAC and MIPS images. SMA 2 has no infrared counterpart but coincides with centimeter source VLA 9. Spectral energy distributions constructed from SMA, SCUBA, and Spitzer data yield bolometric temperatures of 83 K for SMA 1 and 70 K for SMA 2. These temperatures along with the submillimeter to total luminosity ratios indicate that SMA 2 is a Class 0 protostar, while SMA 1 is a Class 0/Class I transitional object (L ¼ 17 AE 6 L ). The 12 CO J ¼ 3 ! 2 outflow map shows one major and possibly several smaller outflows centered on the IRS 7 region, with masses and energetics consistent with previous work. We identify the Class 0 source SMA 2/ VLA 9 as the main driver of this outflow. The complex and clumpy spatial and velocity distribution of the HCO + J ¼ 3 ! 2 emission is not consistent with either bulk rotation, or any known molecular outflow activity.

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Section: Scuba 450 and 850 M Resultscontrasting

confidence: 56%

Section: Co Outflowsmentioning

confidence: 99%

Section: Co Outflowsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High Spatial Resolution Observations of Two Young Protostars in the R Corona Australis Region

Groppi

Hunter

Blundell

et al. 2007

ApJ

Self Cite

112

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“…The membership count is probably close to complete for spectral types between B9 and M6, considering that the cluster has been observed in the optical, X ray, IR, and submillimeter (e.g. López-Martí et al 2005Groppi et al 2004Groppi et al , 2007Peterson et al 2011;Sicilia-Aguilar et al 2008, 2011a. Taking into account only the number of stars and not their mass, we arrive to a stellar density of about 3000 stars/pc 3 .…”

Section: What Drives Disk Evolution and Dispersal In Tr 37? Clues Fromentioning

confidence: 67%

The low-mass stellar population in the young cluster Tr 37

Sicilia‐Aguilar

Kim

Соболев

et al. 2013

A&A

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Aims. We present a study of accretion and protoplanetary disks around M-type stars in the 4 Myr-old cluster Tr 37. With a well-studied solar-type population, Tr 37 is a benchmark for disk evolution. Methods. We used low-resolution spectroscopy to identify and classify 141 members (78 new ones) and 64 probable members, mostly M-type stars. Hα emission provides information about accretion. Optical, 2MASS, Spitzer, and WISE data are used to trace the spectral energy distributions (SEDs) and search for disks. We construct radiative transfer models to explore the structures of fulldisks, pre-transition, transition, and dust-depleted disks. Results. Including the new members and the known solar-type stars, we confirm that a substantial fraction (∼2/5) of disks show signs of evolution, either as radial dust evolution (transition/pre-transition disks) or as a more global evolution (with low small-dust masses, dust settling, and weak/absent accretion signatures). Accretion is strongly dependent on the SED type. About half of the transition objects are consistent with no accretion, and dust-depleted disks have weak (or undetectable) accretion signatures, especially among M-type stars. Conclusions. The analysis of accretion and disk structure suggests a parallel evolution of dust and gas. We find several distinct classes of evolved disks, based on SED type and accretion status, pointing to different disk dispersal mechanisms and probably different evolutionary paths. Dust depletion and opening of inner holes appear to be independent processes: most transition disks are not dust-depleted, and most dust-depleted disks do not require inner holes. The differences in disk structure between M-type and solar-type stars in Tr 37 (4 Myr old) are not as remarkable as in the young, sparse, Coronet cluster (1−2 Myr old), suggesting that other factors, like the environment/interactions in each cluster, are likely to play an important role in the disk evolution and dispersal. Finally, we also find some evidence of clumpy star formation or mini-clusters within Tr 37.

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Submillimeter Astronomy from the South Pole (AST/RO)

Stark

2012

Proc. IAU

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Abstract. The Antarctic Submillimeter Telescope and Remote Observatory (AST/RO), a 1.7 m diameter offset Gregorian telescope for astronomy and aeronomy studies at wavelengths between 200 and 2000 μm, saw first light in 1995 and operated until 2005. It was the first radio telescope to operate continuously throughout the winter on the Antarctic Plateau. It served as a site testing instrument and prototype for later instruments, as well as executing a wide variety of scientific programs that resulted in six doctoral theses and more than one hundred scientific publications. The South Pole environment is unique among observatory sites for unusually low wind speeds, low absolute humidity, and the consistent clarity of the submillimeter sky. Especially significant are the exceptionally low values of sky noise found at this site, a result of the small water vapor content of the atmosphere. Multiple submillimeter-wave and Terahertz detector systems were in operation on AST/RO, including heterodyne and bolometric arrays. AST/RO's legacy includes comprehensive submillimeter-wave site testing of the South Pole, spectroscopic studies of 492 GHz and 809 GHz neutral atomic carbon and 460 GHz and 806 GHz carbon monoxide in the Milky Way and Magellanic Clouds, and the first detection of the 1.46 THz [N II] line from a ground-based observatory.

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Millimeter and Submillimeter Survey of the R Coronae Australis Region

Cited by 21 publications

References 23 publications

High Spatial Resolution Observations of Two Young Protostars in the R Corona Australis Region

High Spatial Resolution Observations of Two Young Protostars in the R Corona Australis Region

The low-mass stellar population in the young cluster Tr 37

Submillimeter Astronomy from the South Pole (AST/RO)

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