Academic Journal
NEAR-IR SUB-ARCSECOND OBSERVATIONS OF ULTRA-COMPACT H ii REGIONS 1
| العنوان: | NEAR-IR SUB-ARCSECOND OBSERVATIONS OF ULTRA-COMPACT H ii REGIONS 1 |
|---|---|
| المؤلفون: | Carlos Alvarez, Markus Feldt, Thomas Henning, Elena Puga, Wolfgang Brandner, Bringfried Stecklum |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://arxiv.org/pdf/astro-ph/0407139v1.pdf. |
| سنة النشر: | 2004 |
| المجموعة: | CiteSeerX |
| الوصف: | We present adaptive-optics (AO) assisted J, H and K/K ′ images of 8 ultra-compact H ii regions (UC H iis) taken with the ALFA and ADONIS AO systems at Calar Alto and La Silla observatories. The images show details of the stellar population and the near-IR morphology of UC H iis with unprecedented resolution. We have searched for the ionizing sources of the regions using near-IR photometry. The spectral type of the ionizing and most luminous stars inferred from our photometry has been compared with spectral type estimates from IRAS and published radio-continuum measurements. We find that the photometric near-IR spectral types are earlier than estimates from radio and IRAS data. This difference is alleviated when stellar spherical models including line blanketing and stellar winds instead of non-LTE plane-parallel models are used to derive the radio- and IRAS-based spectral types. We also made an attempt to correlate the properties of the near-IR ionizing population with MSX data and published CS measurements. No correlation was found. We note that in two of the regions (G309.92+0.48 and G61.48+0.09B1), the best candidate to ionize the region is possibly a super-giant. |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.254.3886; http://arxiv.org/pdf/astro-ph/0407139v1.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.254.3886 http://arxiv.org/pdf/astro-ph/0407139v1.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.19D45341 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |