Discovery of a shell around Alpha Lyrae

Aumann, H. H.; Gillett, F. C.; Beichman, C. A.; Dejong, T; Houck, [No Value]; Low, F. J.; Neugebauer, G.; Walker, R. G.; Wesselius, P. R.

doi:10.1086/184214

Cited by 594 publications

(398 citation statements)

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“…The long-standing use of Vega as a spectrophotometric standard (e.g., Hayes 1967;Straizys et al 1976) makes understanding the surface brightness distribution of this object at the highest levels of detail more than an abstract scientific exercise, and one of fundamental utility. The discovery of Vega's debris disk (Aumann et al 1984) due to its mid-infrared excess flux called into question its validity as a fundamental standard. This situation has been further complicated by the fact that the star is a rapid rotator, as first suggested by Gray (1988).…”

Section: Vega (α Lyr)mentioning

confidence: 99%

Interferometric observations of rapidly rotating stars

Belle

2012

Astron Astrophys Rev

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Optical interferometry provides us with a unique opportunity to improve our understanding of stellar structure and evolution. Through direct observation of rotationally distorted photospheres at sub-milliarcsecond scales, we are now able to characterize latitude dependencies of stellar radius, temperature structure, and even energy transport. These detailed new views of stars are leading to revised thinking in a broad array of associated topics, such as spectroscopy, stellar evolution, and exoplanet detection. As newly advanced techniques and instrumentation mature, this topic in astronomy is poised to greatly expand in depth and influence.

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Section: Vega (α Lyr)mentioning

confidence: 99%

Interferometric observations of rapidly rotating stars

Belle

2012

Astron Astrophys Rev

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“…The first extensive survey of the mid-to far-infrared sky was made by the IRAS mission launched in 1983 (Neugebauer et al 1984). IRAS surveyed 87% of the sky in four photometric bands at 12 μm, 25 μm, 60 μm and 100 μm and substantially pioneered the various new fields of astronomy, like circumstellar debris disks around Vegalike stars (Aumann et al 1984) and a new class of galaxies that radiate most of their energy in the infrared (Soifer et al 1987).…”

Section: Introductionmentioning

confidence: 99%

The AKARI/IRC mid-infrared all-sky survey

Ishihara

Onaka

Kataza

et al. 2010

A&A

541

249

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Context. AKARI is the first Japanese astronomical satellite dedicated to infrared astronomy. One of the main purposes of AKARI is the all-sky survey performed with six infrared bands between 9 μm and 200 μm during the period from 2006 May 6 to 2007 August 28. In this paper, we present the mid-infrared part (9 μm and 18 μm bands) of the survey carried out with one of the on-board instruments, the infrared camera (IRC). Aims. We present unprecedented observational results of the 9 μm and 18 μm AKARI all-sky survey and detail the operation and data processing leading to the point source detection and measurements. Methods. The raw data are processed to produce small images for every scan, and the point sources candidates are derived above the 5σ noise level per single scan. The celestial coordinates and fluxes of the events are determined statistically and the reliability of their detections is secured through multiple detections of the same source within milli-seconds, hours, and months from each other. Results. The sky coverage is more than 90% for both bands. A total of 877 091 sources (851 189 for 9 μm, 195 893 for 18 μm) are confirmed and included in the current release of the point source catalog. The detection limit for point sources is 50 mJy and 90 mJy for the 9 μm and 18 μm bands, respectively. The position accuracy is estimated to be better than 2 . Uncertainties in the in-flight absolute flux calibration are estimated to be 3% for the 9 μm band and 4% for the 18 μm band. The coordinates and fluxes of detected sources in this survey are also compared with those of the IRAS survey and are found to be statistically consistent.

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“…The first large and unbiased survey of the infrared (IR) sky, conducted by the Infrared Astronomical Satellite (IRAS), revealed that approximately 15% of nearby main-sequence stars have an excess of 12−100 μm emission corresponding to a luminosity at least 2 × 10 −5 times higher than that expected from a pure stellar photosphere (Backman & Paresce 1993;Backman & Gillett 1987;Aumann et al 1984). This indicates that these stars are surrounded by warm circumstellar dust, interpreted as originating in a disk of debris left over from planet formation, which is being heated by stellar optical and ultraviolet radiation, and re-radiating at mid-and far-IR wavelengths.…”

Section: Introductionmentioning

confidence: 99%

A submillimetre search for cold extended debris disks in the $\mathsf{\beta}$ Pictoris moving group

Nilsson

Liseau

Brandeker

et al. 2009

A&A

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Context. Previous observations with the Infrared Astronomical Satellite and the Infrared Space Observatory, and ongoing observations with Spitzer and AKARI, have led to the discovery of over 200 debris disks, based on detected mid-and far infrared excess emission, indicating warm circumstellar dust. To constrain the properties of these systems, e.g., to more accurately determine the dust mass, temperature and radial extent, follow-up observations in the submillimetre wavelength region are needed. Aims. The β Pictoris moving group is a nearby stellar association of young (∼12 Myr) co-moving stars including the classical debris disk star β Pictoris. Due to their proximity and youth, they are excellent targets when searching for submillimetre emission from cold, extended, dust components produced by collisions in Kuiper-Belt-like disks. They also allow an age independent study of debris disk properties as a function of other stellar parameters. Methods. We observed 7 infrared-excess stars in the β Pictoris moving group with the LABOCA bolometer array, operating at a central wavelength of 870 μm at the 12-m submillimetre telescope APEX. The main emission at these wavelengths comes from large, cold dust grains, which constitute the main part of the total dust mass, and hence, for an optically thin case, make better estimates on the total dust mass than earlier infrared observations. Fitting the spectral energy distribution with combined optical and infrared photometry gives information on the temperature and radial extent of the disk. Results. From our sample, β Pic, HD 181327, and HD 172555 were detected with at least 3σ certainty, while all others are below 2σ and considered non-detections. The image of β Pic shows an offset flux density peak located near the south-west extension of the disk, similar to the one previously found by SCUBA at the JCMT. We present SED fits for detected sources and give an upper limit on the dust mass for undetected ones. Conclusions. We find a mean fractional dust luminosityf dust = 1.1 × 10 −3 at t ≈ 12 Myr, which together with recent data at 100 Myr suggests an f dust ∝ t −α decline of the emitting dust, with α > 0.8.

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Discovery of a shell around Alpha Lyrae

Cited by 594 publications

References 0 publications

Interferometric observations of rapidly rotating stars

Interferometric observations of rapidly rotating stars

The AKARI/IRC mid-infrared all-sky survey

A submillimetre search for cold extended debris disks in the $\mathsf{\beta}$ Pictoris moving group

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