The double blue-straggler sequence in NGC 2173: an artifact of field contamination
Here we discuss the case of the double blue straggler star (BSS) sequence recently detected in the young stellar cluster NGC 2173 in the Large Magellanic Cloud (LMC) by Li et al. (2018, ApJ, 856, 25). In order to investigate this feature we made use of two Hubble Space Telescope (HST) sets of observ...
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| Veröffentlicht in: | Astronomy and astrophysics (Berlin) 2019-01, Vol.621, p.A45 |
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| creator | Dalessandro, E. Ferraro, F. R. Bastian, N. Cadelano, M. Lanzoni, B. Raso, S. |
| description | Here we discuss the case of the double blue straggler star (BSS) sequence recently detected in the young stellar cluster NGC 2173 in the Large Magellanic Cloud (LMC) by Li et al. (2018, ApJ, 856, 25). In order to investigate this feature we made use of two Hubble Space Telescope (HST) sets of observations, one (the same one used by Li et al.) probing the cluster central regions, and the other sampling the surrounding field. We demonstrate that when field star decontamination is applied, ∼40% of the BSS population selected by Li et al. turns out to be composed of field stars interlopers. This contamination mainly affects one of the two sequences, which therefore disappears in the decontaminated color-magnitude diagram. We analyze the result of tens different decontamination realizations: we find no evidence of a double BSS sequence in any of them. We therefore conclude that NGC 2173 harbors a normal single (poorly populated) BSS sequence and that particular care needs to be devoted to the field decontamination process in any study aimed at probing stellar population features or star counts in the LMC clusters. |
| doi_str_mv | 10.1051/0004-6361/201834011 |
| format | Article |
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R. ; Bastian, N. ; Cadelano, M. ; Lanzoni, B. ; Raso, S.</creator><creatorcontrib>Dalessandro, E. ; Ferraro, F. R. ; Bastian, N. ; Cadelano, M. ; Lanzoni, B. ; Raso, S.</creatorcontrib><description>Here we discuss the case of the double blue straggler star (BSS) sequence recently detected in the young stellar cluster NGC 2173 in the Large Magellanic Cloud (LMC) by Li et al. (2018, ApJ, 856, 25). In order to investigate this feature we made use of two Hubble Space Telescope (HST) sets of observations, one (the same one used by Li et al.) probing the cluster central regions, and the other sampling the surrounding field. We demonstrate that when field star decontamination is applied, ∼40% of the BSS population selected by Li et al. turns out to be composed of field stars interlopers. This contamination mainly affects one of the two sequences, which therefore disappears in the decontaminated color-magnitude diagram. We analyze the result of tens different decontamination realizations: we find no evidence of a double BSS sequence in any of them. 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This contamination mainly affects one of the two sequences, which therefore disappears in the decontaminated color-magnitude diagram. We analyze the result of tens different decontamination realizations: we find no evidence of a double BSS sequence in any of them. We therefore conclude that NGC 2173 harbors a normal single (poorly populated) BSS sequence and that particular care needs to be devoted to the field decontamination process in any study aimed at probing stellar population features or star counts in the LMC clusters.</description><subject>blue stragglers</subject><subject>Color-magnitude diagram</subject><subject>Contamination</subject><subject>Decontamination</subject><subject>galaxies: star clusters: individual: NGC2173</subject><subject>Hertzsprung-Russell and C-M diagrams</subject><subject>Hubble Space Telescope</subject><subject>Magellanic clouds</subject><subject>methods: observational</subject><subject>Space telescopes</subject><subject>Star clusters</subject><subject>techniques: photometric</subject><issn>0004-6361</issn><issn>1432-0746</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNo9kF1LwzAUhoMoOKe_wJuA13UnH01b72S4KQxFmQrehDQfs7NrZpKC_ns7Jrs6HHjec14ehC4JXBPIyQQAeCaYIBMKpGQcCDlCI8IZzaDg4hiNDsQpOotxPax0AEfoZflpsfF93Vpct73NYgpqtWptwNF-97bTFjcdfpxPMSUFu8GqwyqkximdsHfYNbY1WPsuqU3TqdT47hydONVGe_E_x-h1drec3meLp_nD9HaRaSYgZXlOcqUYV7UzwtCSaCe407XWlS2Y4tRw4NxwzQtXEeoqx0mtTWXzSlijKjZGV_u72-CHpjHJte9DN7yUQ1XOAEpWDhTbUzr4GIN1chuajQq_koDcyZM7NXKnRh7kDalsn2pisj-HiApfUhSsyGUJ73K-qD7eBDzLGfsDVSNvkw</recordid><startdate>20190101</startdate><enddate>20190101</enddate><creator>Dalessandro, E.</creator><creator>Ferraro, F. 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R.</creatorcontrib><creatorcontrib>Bastian, N.</creatorcontrib><creatorcontrib>Cadelano, M.</creatorcontrib><creatorcontrib>Lanzoni, B.</creatorcontrib><creatorcontrib>Raso, S.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Astronomy and astrophysics (Berlin)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dalessandro, E.</au><au>Ferraro, F. R.</au><au>Bastian, N.</au><au>Cadelano, M.</au><au>Lanzoni, B.</au><au>Raso, S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The double blue-straggler sequence in NGC 2173: an artifact of field contamination</atitle><jtitle>Astronomy and astrophysics (Berlin)</jtitle><date>2019-01-01</date><risdate>2019</risdate><volume>621</volume><spage>A45</spage><pages>A45-</pages><issn>0004-6361</issn><eissn>1432-0746</eissn><abstract>Here we discuss the case of the double blue straggler star (BSS) sequence recently detected in the young stellar cluster NGC 2173 in the Large Magellanic Cloud (LMC) by Li et al. (2018, ApJ, 856, 25). In order to investigate this feature we made use of two Hubble Space Telescope (HST) sets of observations, one (the same one used by Li et al.) probing the cluster central regions, and the other sampling the surrounding field. We demonstrate that when field star decontamination is applied, ∼40% of the BSS population selected by Li et al. turns out to be composed of field stars interlopers. This contamination mainly affects one of the two sequences, which therefore disappears in the decontaminated color-magnitude diagram. We analyze the result of tens different decontamination realizations: we find no evidence of a double BSS sequence in any of them. We therefore conclude that NGC 2173 harbors a normal single (poorly populated) BSS sequence and that particular care needs to be devoted to the field decontamination process in any study aimed at probing stellar population features or star counts in the LMC clusters.</abstract><cop>Heidelberg</cop><pub>EDP Sciences</pub><doi>10.1051/0004-6361/201834011</doi><oa>free_for_read</oa></addata></record> |
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| subjects | blue stragglers Color-magnitude diagram Contamination Decontamination galaxies: star clusters: individual: NGC2173 Hertzsprung-Russell and C-M diagrams Hubble Space Telescope Magellanic clouds methods: observational Space telescopes Star clusters techniques: photometric |
| title | The double blue-straggler sequence in NGC 2173: an artifact of field contamination |
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