Category Archives: astro-ph

PoW for Sept. 28 :: FSR584, abundances, compact objects…

Hello, welcome to another issue of “Papers of the Week”, covering publications and preprint related to the world of Galactic Globular Clusters!

This issue features the entry (as a preprint on astro-ph) of the discover of *another* globular clusters in our Galaxy, FSR584 (see the paper by Bica et al.), as well as a good amount of publications on abundances, variability and compatc objects.

As always, any feedback on PoW will be much appreciated 😉

MC

== General ==

§ Origin of the abundance patterns in Galactic globular clusters: constraints on dynamical and chemical properties of globular clusters
Authors: T. Decressin, C. Charbonnel, G. Meynet
http://babbage.sissa.it/abs/0709.4160

§ Compact objects in globular clusters
Authors: Thomas J. Maccarone, Christian Knigge (University of Southampton)
http://babbage.sissa.it/abs/0709.3732

§ Formation of the Galactic globular clusters with He-rich stars in low-mass halos virialized at high redshift
Authors: K. Bekki, H. Yahagi, M. Nagashima, D. A. Forbes
http://babbage.sissa.it/abs/0709.3564

== Individual ==

§ On the Radial Distribution of White Dwarfs in the Globular Cluster NGC 6397
Authors: D. S. Davis (UBC), H. B. Richer (UBC), I. R. King (UWash), J. Anderson (Rice), J. Coffey (UBC), G. G. Fahlman (HIA/NRC), J. Hurley (Swinburne), J. S. Kalirai (UCSC)
http://babbage.sissa.it/abs/0709.4286

§ The ACS Survey of Galactic Globular Clusters. III. The Double Subgiant Branch of NGC 1851
Authors: A. P. Milone, L. R. Bedin, G. Piotto, J. Anderson, I. R. King, A. Sarajedini, A. Dotter, B. Chaboyer, A. Marin-Franch, S. Majewski, A. Aparicio, M. Hempel, N. E. Q. Paust, I. N. Reid, A. Rosenberg, M. Siegel
http://babbage.sissa.it/abs/0709.3762

§ Abundances on the Main Sequence of Omega Centauri
Laura M. Stanford , G. S. Da Costa , and John E. Norris
http://www.journals.uchicago.edu/…/71221.abstract.html

§ FSR584 – a new globular cluster in the Galaxy?
Authors: E. Bica, C. Bonatto, S. Ortolani, B. Barbuy
http://babbage.sissa.it/abs/0709.3315

§ The chemical abundance of the very metal-rich old open clusters NGC 6253 and NGC 6791
E. Carretta, A. Bragaglia, and R. G. Gratton
http://www.aanda.org/index.php?option=article&access=doi&doi=10.1051/0004-6361:20065213

== Extragalactic ==

§ The Globular Cluster System of M60 (NGC 4649). I. CFHT MOS Spectroscopy and Database
Authors: Myung Gyoon Lee, Ho Seong Hwang, Hong Soo Park, Jang-Hyun Park , Sang Chul Kim, Young-Jong Sohn, Sang-Gak Lee, Soo-Chang Rey, Young-Wook Lee, Ho-Il Kim
http://babbage.sissa.it/abs/0709.4308

==================================================================

A “quick list” (updated [more or less…] daily) of PoW papers is always available at the URL:
http://del.icio.us/mcastel/pow

==================================================================

Advertisements

FSR 584: Another new nearby globular cluster candidate

Bica et.al. have announced another nearby globular cluster candidate in the Milky Way:

http://arxiv.org/abs/0709.3315

Author: E. Bica, C. Bonatto, S. Ortolani, B. Barbuy
Title: FSR584 – a new globular cluster in the Galaxy?
Comments: Astronomy and Astrophysics, accepted. 6 pages and 6 figures

Abstract: We investigate the nature of the recently catalogued star cluster candidate FSR584, which is projected in the direction of the molecular cloud W3 and may be the nearest globular cluster to the Sun. 2MASS CMDs, the stellar radial density profile, and proper motions are employed to derive fundamental and structural parameters. The CMD morphology and the radial density profile show that FSR584 is an old star cluster. With proper motions, the properties of FSR584 are consistent with a metal-poor globular cluster with a well-defined turnoff and evidence of a blue horizontal-branch. FSR584 might be a Palomar-like halo globular cluster that is moving towards the Galactic plane. The distance from the Sun is approx 1.4kpc, and it is located at approx 1kpc outside the Solar circle. The radial density profile is characterized by a core radius of rc=0.3+/-0.1 pc. However, we cannot exclude the possibility of an old open cluster. Near-infrared photometry coupled to proper motions support the scenario where FSR584 is a new globular cluster in the Galaxy. The absorption is A_V=9.2+/-0.6$, which makes it a limiting object in the optical and explains why it has so far been overlooked

This one is apparently projected over starforming region W3, and at a distance of only 1.4 kpc (4,600 ly). It would probably even beat the recently discovered record holder, FSR 1767. However, as of this time, the authors cannot exclude that this may be an old open cluster.

A preliminary webpage for this probable globular has been created at

http://www.seds.org/~spider/spider/MWGC/fsr0584.html

PoW for Sept. 21 :: Omega Cen, WD kicks…

Hello, welcome to the third issue of “Paper of the week”,covering publications and preprint
related to the world of Galactic Globular Clusters. This week I managed to find only a few preprints related to GGCs, and as you can see, it is Omega Centaury that continues to attract mostly the attenction of astronomers…

As always, any feedback on PoW will be much appreciated 😉

MC

== General ==

§ “RR Lyrae stars in Galactic globular clusters. VI. The Period-Amplitude relation”
Authors: G. Bono, F. Caputo, M. Di Criscienzo
http://babbage.sissa.it/abs/0709.3177

§ Constraining white-dwarf kicks in globular clusters : II. Observational Significance
Authors: Jeremy S. Heyl
http://babbage.sissa.it/abs/0709.3118

== Omega Centauri ==

§ “A spectral atlas of post-main-sequence stars in omega Centauri:
kinematics, evolution, enrichment and interstellar medium”
(Revised version)
Authors: Jacco Th. van Loon, Floor van Leeuwen, Barry Smalley, Andrew W. Smith, Nicola A. Lyons,
Iain McDonald, Martha L. Boyer
http://babbage.sissa.it/abs/0709.2353

§ “The Hottest Horizontal-Branch Stars in omega Centauri –
Late Hot Flasher vs. Helium Enrichment”
Authors: S. Moehler, S. Dreizler, T. Lanz, G. Bono, A.V. Sweigar, A. Calamida, M.Monelli, M. Nonino
http://babbage.sissa.it/abs/0709.2839

* A “quick list” of PoW papers is also available at http://del.icio.us/mcastel/pow (under construction)

PoW for Sept. 14 :: M55, 47 Tuc, NGC 2419…

Hello, this is the second (experimental) issue of “Paper Of the Week(PoW), covering publications and preprint related to the world of Galactic Globular Clusters:


PoW for Sept. 14, 2007


— Extragalactic, LMC

Title: On the origin of the kinematical differences between the stellar halo and the old globular cluster system in the Large Magellanic Cloud

Authors: Kenji Bekki

Montly Notices, Online Early Article


— M55, BSS

Title: The surprising external upturn of the Blue Straggler radial distribution in M55

Authors: B. Lanzoni , E. Dalessandro , S. Perina , F.R. Ferraro , R.T. Rood , A. Sollima


http://babbage.sissa.it/abs/0709.1609


— 47 Tuc, abundances Title: Globular Cluster Abundances from High-Resolution Integrated Light Spectra, I: 47 Tuc
Authors: Andrew McWilliam, Rebecca A. Bernstein

 http://babbage.sissa.it/abs/0709.1964



— M54, Sagittarius DSphTitle: The ACS Survey of Galactic Globular Clusters: M54 and Young Populations in the Sagittarius Dwarf Spheroidal Galaxy
Authors : Michael H. Siegel et al.
The Astrophysical Journal Letters Volume 667, Number 1



— NGC2419

Title: On the Remote Galactic Globular Cluster NGC 2419
Authors:
Vincenzo Ripepi et al.
The Astrophysical Journal Letters Volume 667, Number 1
The surface brightness profile of the remote cluster NGC2419:
M. Bellazzini
A&A 473 (2007) 171-176
http://www.aanda.org/10.1051/0004-6361:20078130


— NGC 6253The chemical abundance of the very metal-rich old open clusters NGC 6253 and NGC 6791:
E. Carretta, A. Bragaglia and R. G. Gratton
A&A 473 (2007) 129-141
http://www.aanda.org/10.1051/0004-6361:20065213


As usual, my apologize for article I may have missed!
Do you think PoW can be useful ? Any feedback will be appreciated ! 😉
Marco C.

Blogged with Flock

Tags: , ,

Preprints of the week: NGC6558, NGC6397, FSR 584…

 Hello! Back from Cefalù workshop (anyone else there?), here is a (possibly incomplete) list of the paper appeared in preprint services during this week:

 Title:   NGC 6558: A Blue Horizontal Branch Moderately Metal-Poor Globular Cluster in the Bulge
Authors:   Barbuy, B.; Zoccali, M.; Ortolani, S.; Minniti, D.; Hill, V.; Renzini, A.; Bica, E.; Gómez, A.

 http://cdsads.u-strasbg.fr/abs/2007AJ….134.1613B

Title:   Atomic Diffusion and Mixing in Old Stars I. VLT/FLAMES-UVES Observations of Stars in NGC 6397
Authors:   Korn, A. J.; Grundahl, F.; Richard, O.; Barklem, P. S.; Mashonkina, L.; Collet, R.; Gustafsson, B.; Piskunov, N.

http://cdsads.u-strasbg.fr/abs/2007arXiv0709.0639K 

Title:   The surface density profile of NGC 6388: a good candidate for harboring an intermediate-mass black hole
Authors:   Lanzoni, B.; Dalessandro, E.; Ferraro, F. R.; Miocchi, P.; Valenti, E.; Rood, R. T.;

 http://cdsads.u-strasbg.fr/abs/2007arXiv0709.0119L

Title:   FSR 584 – a new globular cluster in the Galaxy?
Authors:   Bica, E.; Bonatto, C.; Ortolani, S.; Barbuy, B.

http://cdsads.u-strasbg.fr/abs/2007A%26A…472..483B

Title:   The fraction of binary systems in the core of 13 low-density Galactic globular clusters
Authors:   Sollima, A.; Beccari, G.; Ferraro, F. R.; Fusi Pecci, F.; Sarajedini, A.

 http://cdsads.u-strasbg.fr/abs/2007MNRAS.380..781S

Title:   The tidal tails of NGC 5466
Authors:   Fellhauer, M.; Evans, N. W.; Belokurov, V.; Wilkinson, M. I.; Gilmore, G.

http://cdsads.u-strasbg.fr/abs/2007MNRAS.380..749F

Title:   Millisecond pulsars around intermediate-mass black holes in globular clusters
Authors:   Devecchi, B.; Colpi, M.; Mapelli, M.; Possenti, A.

http://cdsads.u-strasbg.fr/abs/2007MNRAS.380..691D 

Title:   Tidal tails around globular clusters
Authors:   Montuori, M.; Capuzzo-Dolcetta, R.; Di Matteo, P.; Miocchi, P.

http://cdsads.u-strasbg.fr/abs/2007arXiv0709.0460M 

Papers on Omega Cen, NGC6440, NGC6388, NGC6441, M4…

Hello, here is a brief list (not sure if complete…) with the latest preprints regarding Galactic Globular Clusters, which appeared this month on astro-ph:


FSR 1767: New Milky Way Globular Cluster, No. 158

A new globular cluster in the Milky Way has just been announced: FSR 1767.

This one is particular in being the closest known globular to us at only about 4,900 light-years, thus beating M4 and NGC 6397 at about 6,500 to 7,500 ly. It is a low-mass globular with perhaps 1/10 of the stars in M4, and estimated as of absolute magnitude -4.7 Mv, diameter 6.5 ly.

According to my counting, this is currently Milky Way Globular Cluster No. 158 to be recognized. [- Hartmut]

Reference:
Charles Bonatto, Eduardo Bica, Sergio Ortolani, Beatriz Barbuy, 2007. FSR1767 – a new globular cluster in the Galaxy. To be published in MNRAS.

Abstract:
The globular cluster (GC) nature of the recently catalogued candidate FSR 1767 is established in the present work. It results as the closest GC so far detected in the Galaxy. The nature of this object is investigated by means of 2MASS colour-magnitude diagrams (CMDs), the stellar radial density profile (RDP) and proper-motions (PM). The properties are consistent with an intermediate metallicity ($\feh\approx-1.2$) GC with a well-defined turnoff (TO), red-giant branch (RGB) and blue horizontal-branch (HB). The distance of FSR 1767 from the Sun is $\ds\approx1.5$ kpc, and it is located at the Galactocentric distance $\rgc\approx5.7$ kpc. With the space velocity components $(V,W)=(184\pm14,-43\pm14)\rm km s^{-1}$, FSR 1767 appears to be a Palomar-like GC with $\mv\approx-4.7$, that currently lies $\approx57$ pc below the Galactic plane. The RDP is well represented by a King profile with the core and tidal radii $\rc=0.24\pm0.08$ pc and $\rt=3.1\pm1.0$ pc, respectively, with a small half-light radius $\rh=0.60\pm0.15$ pc. The optical absorption is moderate for an infrared GC, $A_V=6.2\pm0.3$, which together with its central direction and enhanced contamination explains why it has so far been overlooked.

Preprint:
http://www.arxiv.org/abs/0708.0501

SEDS webpage:
http://www.seds.org/~spider/spider/MWGC/fsr1767.html