Characteristics of the Galaxy according to Cepheids

Majaess, D.; Turner, D. G.; Lane, David J.

doi:10.1111/j.1365-2966.2009.15096.x

Cited by 118 publications

(136 citation statements)

References 96 publications

(128 reference statements)

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“…The ascent from negative b (ℓ ∼ 270−300 • to ℓ ∼ 90 • ) is likewise observed in the distribution of classical Cepheids (Majaess et al 2009, see also the Dame et al 2001 CO survey). Distinct conglomerates containing sizable numbers of YSOs are discernible in Fig.…”

Section: Yso Complexesmentioning

confidence: 82%

Discovering protostars and their host clusters via WISE

Majaess¹

2012

Astrophys Space Sci

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A hybrid JHK s − W 1 W 2 W 3 W 4 high-spectral index (α) selection scheme was employed to identify (sub)clusters of class I/f candidate protostars (YSOs) in WISE observations (the Wide-Field Infrared Survey Explorer). n > 10 4 candidate YSOs were detected owing to WISE's advantageous all-sky spatial coverage, and a subsample (n ∼ 200) of their heavily-obscured host (sub)clusters were correlated with the Avedisova (2002) and Dias et al. (2002) catalogs of star-forming regions. Forthcoming observations from the VVV/UKIDSS surveys shall facilitate the detection of additional protostars and bolster efforts to delineate the Galactic plane, since the campaigns aim to secure deep JHK s photometry for a pertinent fraction of the WISE targets lacking 2MASS detections, and to provide improved data for YSOs near the limits of the 2MASS survey.

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Section: Yso Complexesmentioning

confidence: 82%

Discovering protostars and their host clusters via WISE

Majaess¹

2012

Astrophys Space Sci

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“…We have included the embedded clusters studied in this paper, as well as those from Paper I and preliminary results from Baume et al (2010). We also include optical results from studies of young open clusters and young populations near the Carina region (Vázquez et al 2005;Baume et al 2009;Carraro & Costa 2009) and long-period Cepheids (see Majaess et al 2009). We also plot the Hii-region compilation of Hou et al (2009) and the four-arm Galactic model of Vallée (2008).…”

Section: Milky Way Structurementioning

confidence: 99%

Massive open star clusters using the VVV survey

Chené

Borissova

Bonatto

et al. 2013

A&A

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Context. The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Nearly 150 new open clusters and cluster candidates have been discovered in this survey. Aims. This is the second in a series of papers about young, massive open clusters observed using the VVV survey. We present the first study of six recently discovered clusters. These clusters contain at least one newly discovered Wolf-Rayet (WR) star. Methods. Following the methodology presented in the first paper of the series, wide-field, deep JHK s VVV observations, combined with new infrared spectroscopy, are employed to constrain fundamental parameters for a subset of clusters. Results. We find that the six studied stellar groups are real young (2-7 Myr) and massive (between 0.8 and 2.2 × 10 3 M ) clusters. They are highly obscured (A V ∼ 5−24 mag) and compact (1-2 pc). In addition to WR stars, two of the six clusters also contain at least one red supergiant star, and one of these two clusters also contains a blue supergiant. We claim the discovery of 8 new WR stars, and 3 stars showing WR-like emission lines which could be classified WR or OIf. Preliminary analysis provides initial masses of ∼30-50 M for the WR stars. Finally, we discuss the spiral structure of the Galaxy using the six new clusters as tracers, together with the previously studied VVV clusters.

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“…Cepheid variables and young open clusters define an analogous (local) spiral pattern (e.g. Majaess et al 2009). Danks 1 and Danks 2 lie beyond the SagittariusCarina spiral arm and occupy the Centaurus arm, along with numerous young Cepheids and clusters (e.g., TW Nor, VW Cen, and VVV CL070).…”

Section: Milky Way's Structurementioning

confidence: 99%

Massive open star clusters using the VVV survey

Chené

Borissova

Clarke

et al. 2012

A&A

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Context. The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Aims. The VVV observations will foster the construction of a sample of Galactic star clusters with reliable and homogeneously derived physical parameters (e.g., age, distance, and mass, etc.). In this first paper in a series, the methodology employed to establish cluster parameters for the envisioned database are elaborated upon by analysing four known young open clusters: Danks 1, Danks 2, RCW 79, and DBS 132. The analysis offers a first glimpse of the information that can be gleaned from the VVV observations for clusters in the final database. Methods. Wide-field, deep JHK s VVV observations, combined with new infrared spectroscopy, are employed to constrain fundamental parameters for a subset of clusters. Results. Results are inferred from VVV near-infrared photometry and numerous low resolution spectra (typically more than 10 per cluster). The high quality of the spectra and the deep wide-field VVV photometry enables us to precisely and independently determine the characteristics of the clusters studied, which we compare to previous determinations. An anomalous reddening law in the direction of the Danks clusters is found, specifically E(J − H)/E(H − Ks) = 2.20 ± 0.06, which exceeds published values for the inner Galaxy. The G305 star forming complex, which includes the Danks clusters, lies beyond the Sagittarius-Carina spiral arm and occupies the Centaurus arm. Finally, the first deep infrared colour-magnitude diagram of RCW 79 is presented, which reveals a sizeable pre-main sequence population. A list of candidate variable stars in G305 region is reported. Conclusions. This study demonstrates the strength of the dataset and methodology employed, and constitutes the first step of a broader study which shall include reliable parameters for a sizeable number of poorly characterised and/or newly discovered clusters.Key words. open clusters and associations: general -infrared: stars -surveys IntroductionIt is commonly accepted that the majority of stars with masses ≥0.50 M form in clustered environments (e.g. than half of these clusters have actually been studied, and this subset suffers from further selection biases. Extending this current sample towards the Milky Way's highly obscured central region would provide unique insight into the formation, evolution, and dissipation of open clusters in the Galactic environment. To achieve this goal, we are using the unprecedented deep infrared data from the VISTA Variables in the Vía Láctea (VVV) survey (Minniti et al. 2010;Saito et al. 2012), one of the six ESO Public Surveys operating on the new 4-m Visible and Infrared Survey Telescope for Astronomy (VISTA). We are in the process of building a large sample of star clusters (including many discovered by our group; Borissova et al. 2011; Bonatto et al., in prep.), that are practically invisible in th...

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Characteristics of the Galaxy according to Cepheids

Cited by 118 publications

References 96 publications

Discovering protostars and their host clusters via WISE

Discovering protostars and their host clusters via WISE

Massive open star clusters using the VVV survey

Massive open star clusters using the VVV survey

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