Open Access Published by De Gruyter Open Access

Volume 22 Issue 3

September 2013

Issue of Open Astronomy

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Contents
Journal Overview

Open Access February 18, 2017

Seven-Color Photometry and Classification of Stars in the Direction of Open Cluster M29 (NGC 6913) in Cygnus

K. Milašius, R. P. Boyle, F. J. Vrba, R. Janusz, V. Straižys, K. Černis, V. Laugalys, K. Zdanavičius, J. Zdanavičius, A. Kazlauskas, R. Smilgys

Page range: 181-221

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Abstract

Magnitudes and color indices in the Vilnius seven-color system were determined for 1752 stars down to V = 19.5 mag in the direction of the open cluster M29 (NGC 6913). The region is centered at RA = 20:24, DEC = +38:30 (J2000) and covers an area of 1.5 sq. deg. The photometric data are used to classify about 70% of stars in spectral and luminosity classes and peculiarity types.

Open Access February 18, 2017

Seven-Color Photometry and Classification of Stars in the Vicinity of the Emission Nebula Sh2-205

V. Čepas, J. Zdanavičius, K. Zdanavičius, V. Straižys, V. Laugalys

Page range: 223-242

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Abstract

We present the results of CCD photometry in the seven-color Vilnius system for 922 stars down to V ~ 17 mag in a 1.5 square degree field at the northern edge of the HII region Sh2-205, at the Perseus and Camelopardalis border. Using the intrinsic color indices and photometric reddening-free Q- parameters, two-dimensional spectral types for most stars are determined.

Open Access February 18, 2017

Seven-Color Photometry and Classification of Stars in the Vicinity of the Dark Cloud TGU H994 (LDN 1399, 1400 and 1402)

V. Čepas, J. Zdanavičius, K. Zdanavičius, V. Straižys, V. Laugalys

Page range: 243-258

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Abstract

The results of CCD photometry in the seven-color Vilnius system are given for 727 stars down to V ~ 17 mag in a 1.5 square degree field in the region of dark cloud TGU H994 P1 (or LDN 1399, LDN 1400 and LDN 1402) in Camelopardalis. Using the intrinsic color indices and photometric reddening-free Q -parameters, two-dimensional spectral types for 73% of stars are determined.

Open Access February 18, 2017

On the Nature of V2282 Sgr

R. Nesci, C. Rossi, A. Frasca, E. Marilli, P. Persi

Page range: 259-271

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Abstract

The star V2282 Sgr is positionally consistent with a strong Chandra X-ray and a Spitzer /IRAC mid-infrared source. We derived its long-term I -band light curve from the photographic archives of the Asiago and Catania Observatories, covering the years from 1965 to 1984. Also, CCD R C photometry of 2009 was re-analyzed. Optical spectra were collected at the Loiano Observatory in 2011 and 2012. J,H,K s photometry, obtained from several sources in different epochs was compared and the Spitzer images were re-analyzed. V2282 Sgr was found to be irregular variable in all wavelengths. Spectroscopically, it shows strong emission features (H Balmer lines, [N II] 6584Å and [O III] 5007/4959Å) while the Na I D-doublet is very strong, indicating a circumstellar envelope. A single thermal energy distribution cannot reproduce the observed SED, while it can be explained as the sum of a G-type star plus a variable circumstellar disk, which mimics YSO of class 0/I. Most likely, V2282 Sgr is a 1–2 M ⊙ mass pre-main-sequence star with an accretion disk.

About this journal

About this journal

Open Astronomy (formerly Baltic Astronomy) was founded by the Institute of Theoretical Physics and Astronomy (Lithuania) in 1992 and acquired by De Gruyter in 2016.

Open Astronomy is a peer-reviewed, and entirely open-access online journal dedicated to disseminating research across the entire spectrum of astronomy and astrophysics. Our publication encompasses diverse topics, ranging from solar, planetary, and stellar physics to the realms of extragalactic astronomy and cosmology, encompassing the instrumental advancements and space missions that propel our understanding of the cosmos forward.

Within our pages, we welcome research papers in which authors present their original work and comprehensive reviews that synthesize the current state of knowledge in specific fields. Additionally, the journal encourages proposals for special issues, which will undergo careful evaluation by our esteemed editorial committee. We are committed to advancing the frontiers of astronomical knowledge and facilitating the exchange of ideas within the scientific community.

Our editors-in-chief and the entire editorial board are dedicated to delivering the utmost author-centric experience. We diligently curate a panel of expert reviewers, typically involving two reviewers and actively oversee the entire review process to ensure its integrity and quality.

Aims and Scope

Below, you will find a comprehensive list of topics covered by the journal:

observational and theoretical astronomy

cosmology

stellar physics

solar physics

galactic and extragalactic astronomy

Instrumentations and mission planning

planetary science

space science and astrobiology

astronomical history and education