The new carbon symbiotic star IPHAS J205836.43+503307.2

Corradi, R. L. M.; Sabin, L.; Munari, U.; Cetrulo, G.; Englaro, A.; Angeloni, R.; Greimel, R.; Mampaso, A.

doi:10.1051/0004-6361/201016406

Cited by 10 publications

(16 citation statements)

References 23 publications

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“…carbon rich symbiotics are rare in the MW (Corradi et al 2011). This is probably a reflection of the lower metallicity and higher fraction of C-type stars in NGC 6822.…”

Section: High Ionisation Sourcesmentioning

confidence: 99%

“…Systems that contain a first ascent giant, which is about 80% of systems based on Galactic observations, are classified as S-type, while those sources that contain a Mira variable are referred to as dusty or D-type due to their enhanced mass loss (Belczyński et al 2000;Phillips 2007). The classification of a system as S-or D-type is usually made based on its NIR colours, as the presence of a Mira variable and emission from dust in the circumstellar shell result in much redder colours for D-type systems (Whitelock & Munari 1992;Corradi et al 2011). D-type symbiotics are also often associated with an extended ionised nebula formed from material that is not accreted by the hot companion (Corradi et al 1999(Corradi et al , 2011.…”

Section: High Ionisation Sourcesmentioning

confidence: 99%

“…The classification of a system as S-or D-type is usually made based on its NIR colours, as the presence of a Mira variable and emission from dust in the circumstellar shell result in much redder colours for D-type systems (Whitelock & Munari 1992;Corradi et al 2011). D-type symbiotics are also often associated with an extended ionised nebula formed from material that is not accreted by the hot companion (Corradi et al 1999(Corradi et al , 2011.…”

Section: High Ionisation Sourcesmentioning

confidence: 99%

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Spectral classification of photometrically selected AGB candidates in NGC 6822

Sibbons

Ryan

Napiwotzki

et al. 2015

A&A

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Context. The ratio of C-and M-type asymptotic giant branch (AGB) stars is commonly used to estimate the metallicity of extragalactic populations. Sources in the AGB population must therefore be accurately classified as either C-or M-type. Spectroscopic data are presented for candidate C-and M-type AGB stars, previously classified using JHK photometry, in the Local Group dwarf galaxy NGC 6822. Aims. This paper aims to evaluate the success of the JHK classification criteria used in order to determine the level of error associated with this method, and to refine the criteria for future studies. The success rate of a second independent method of source classification, the CN-TiO method, is also examined. We also review the validity of the 4 kpc radial limit imposed in our previous work. Methods. Spectra of 323 sources, distributed across an area of 2 deg 2 , were taken using the AAOmega multi-fibre spectrograph on the Anglo-Australian Telescope and have been classified using an automated classification system and spectral standards from the literature. Nearly half (135) of these sources were selected in common with a photometric catalogue that relied on the CN-TiO method.Results. Within this sample we were able to classify 158 sources, including 82 C-type giants and one anomalous M-type giant, all members of NGC 6822, and 75 foreground K-and M-type dwarf sources. All but three of the giant sources are located within 3 kpc of the galactic centre. Using this spectroscopic sample, new JHK photometric criteria for the isolation and classification of C-and M-type AGB stars have been derived. The error rate in the CN-TiO method, arising from stars incorrectly classified as C-type, has been estimated to be ∼7%. Conclusions. Based on the new JHK classification criteria, revised estimates of the global C/M ratio, 0.95 ± 0.04, and iron abundance, −1.38 ± 0.06 dex, are presented for NGC 6822.

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“…carbon rich symbiotics are rare in the MW (Corradi et al 2011). This is probably a reflection of the lower metallicity and higher fraction of C-type stars in NGC 6822.…”

Section: High Ionisation Sourcesmentioning

confidence: 99%

Section: High Ionisation Sourcesmentioning

confidence: 99%

Section: High Ionisation Sourcesmentioning

confidence: 99%

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Spectral classification of photometrically selected AGB candidates in NGC 6822

Sibbons

Ryan

Napiwotzki

et al. 2015

A&A

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“…The description of the A&A 567, A49 (2014) photometric method adopted to select symbiotic star candidates was presented by Corradi et al (2008Corradi et al ( , 2010a, hereafter Papers I and II. Along with individual studies of other outstanding objects (Corradi & Giammanco 2010;Corradi et al 2010bCorradi et al , 2011, IPHAS and follow-up spectroscopy allowed us to discover fourteen new symbiotic stars in the 1800 square-degree IPHAS area (covering Galactic latitudes between −5 • and +5 • in the northern sky), where previously only eleven symbiotic stars were known. In these articles, we also emphasized the need for robust selection criteria to distinguish symbiotic stars from the most problematic mimics, and in particular from T Tauri stars and other young stellar objects (YSOs) that are much more frequent than symbiotic stars in the Galactic plane.…”

Section: Introductionmentioning

confidence: 99%

IPHAS and the symbiotic stars

Rodriguez-Flores

Corradi

Mampaso

et al. 2014

A&A

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Context. The IPHAS Hα survey provides a rich database to search for emission-line sources in the northern Galactic plane. Aims. We are systematically searching for symbiotic stars in the Milky Way using IPHAS. Our final goal, a complete census of this class of objects in the Galaxy, is a fundamental figure for discussing their overall properties and relevance to other classes of stars. Methods. Candidate symbiotic stars were selected using a refined combination of IPHAS and 2MASS photometric colours. Optical spectroscopy, together with the analysis of their spectral energy distribution in the IR, were obtained to confirm their nature and determine their main properties. Results. Five new symbiotic stars have been confirmed from spectroscopy at the 10.4 m GTC telescope. In one case, confirming the presence of a red giant star required near infrared spectroscopy. In another case, its symbiotic nature was adopted based on the strong similarity of its optical spectrum and spectral energy distribution to those of other genuinely symbiotic stars. The spectral energy distribution of the two S-types found is well fitted by red-giant model atmospheres up to 22 μm without evidence of IR excesses due to dust. In contrast, the three D-types mostly show emission from hot dust with a temperature around 1000 K. We also present the spectroscopic and photometric monitoring of the symbiotic star IPHASJ190832.31+051226.6 that was originally discovered in outburst, and it has now returned to a lower luminosity status. The spectra of thirteen other sources, all classified as young stellar objects except for a new compact planetary nebula, are also presented.Conclusions. The refinement of our discovery method, the completion of the IPHAS survey and photometric calibration, and the start of the twin survey in the south, VPHAS+, provide excellent perspectives for completing a reliable census of symbiotic stars in the Galaxy in the next few years.

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“…14, named IPHAS J205836.43+503307.2) is a very interesting new symbiotic star which contains a carbon star (Corradi et al 2011). The system was found to be highly variable.…”

Section: Characteristics Of the Iphas Symbiotic Starsmentioning

confidence: 99%

The Search for Symbiotic Stars in the IPHAS Survey

Corradi

2012

Open Astronomy

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Abstract.We have started a project to search for symbiotic stars using the data from IPHAS, the Hα survey of the Northern Galactic plane. Candidates are selected from the IPHAS photometric catalogue based on their colors, combined with the information in the near-infrared from 2MASS. So far, follow-up spectroscopy allowed us to discover 14 new symbiotic stars, compared to the 10 systems previously known in the IPHAS survey area. Their general characteristics and the most notable cases are briefly presented. The spectroscopic campaign also allowed us to refine the selection criteria for symbiotic stars in IPHAS. Perspectives, which include the extension of the survey in the Southern Galactic plane and a portion of the bulge (VPHAS+), are discussed.

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The new carbon symbiotic star IPHAS J205836.43+503307.2

Cited by 10 publications

References 23 publications

Spectral classification of photometrically selected AGB candidates in NGC 6822

Spectral classification of photometrically selected AGB candidates in NGC 6822

IPHAS and the symbiotic stars

The Search for Symbiotic Stars in the IPHAS Survey

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