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Titolo: A UKST survey of blue objects towards the Galactic centre - seven additional fields
Autore: Dufton, PL; Smartt, SJ; Hambly, NC;
- Indirizzi:
- Queens Univ Belfast, Dept Pure & Appl Phys, Belfast BT7 1NN, Antrim, NorthIreland Queens Univ Belfast Belfast Antrim North Ireland BT7 1NN im, NorthIreland Univ Cambridge, Inst Astron, Cambridge CB3 0BA, England Univ Cambridge Cambridge England CB3 0BA ron, Cambridge CB3 0BA, England Univ Edinburgh, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland Univ Edinburgh Edinburgh Midlothian Scotland EH9 3HJ Midlothian, Scotland
- Titolo Testata:
- ASTRONOMY & ASTROPHYSICS
fascicolo: 2,
volume: 373,
anno: 2001,
pagine: 608 - 624
- SICI:
- 1432-0746(200107)373:2<608:AUSOBO>2.0.ZU;2-#
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- B-TYPE STARS; ANTI-CENTER; CHEMICAL-COMPOSITIONS; ABUNDANCE;
- Keywords:
- stars : early-type; stars : fundamental parameters; stars : imaging; galaxy : center;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 30
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Dufton, PL Queens Univ Belfast, Dept Pure & Appl Phys, Belfast BT7 1NN, Antrim, NorthIreland Queens Univ Belfast Belfast Antrim North Ireland BT7 1NN eland
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- Citazione:
- P.L. Dufton et al., "A UKST survey of blue objects towards the Galactic centre - seven additional fields", ASTRON ASTR, 373(2), 2001, pp. 608-624
Abstract
We are searching for early-type stars towards the Galactic centre which are potentially young objects situated within the inner few kiloparsecs of the disk. Photographic photometry from the UK Schmidt Telescope has been usedto identify the bluest candidates in nineteen Schmidt fields (centred close to the Galactic centre). We have previously obtained FLAIR low dispersionspectroscopy for three of these fields to estimate spectral types and herewe present spectroscopy for an additional seven fields. Combining the results for all ten fields, 56 stars were initially classified as early-B type. Estimates of the equivalent widths of their Balmer and He I lines have been used to estimate atmospheric parameters and 32 targets have effective temperatures greater than or equal to 17 000 K (corresponding to a spectral type of B3 or earlier). The spectra of seven of these targets also have absorption lines due to O II and Si III and can be reliably classified as early-B type. Additionally 78 stars have estimated effective temperatures between11 000 and 16 000 K with a further a further 50 objects identified as late-B (or early-A) type. All but two of the early B-type candidates have magnitudes in the range 12.0 less than or equal to V less than or equal to 16.0,and our best estimates of their distance suggest that they could be close to (i.e. R-g < 3 kpc), or even beyond the Galactic centre.
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Documento generato il 25/05/13 alle ore 18:44:20