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Poster Open Access

Mass-loss from multiple populations: hint of a universal mass loss-law for Pop II stars?

Tailo Marco; Antonino P. Milone; Edoardo P. Lagioia; Francesca D'Antona; Sohee Jang; Enrico Vesperini; Anna F. Marino; Paolo Ventura; Vittoria Caloi; Marilia Carlos; Giacomo Cordoni; Emanuele Dondoglio; Anjana Mohandasan; J. Ephrem Nastasio; Maria Vittoria Legnardi


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    "description": "<p>Poster for the Cool stars 20.5 virtual conference.</p>\n\n<p>Abstract:</p>\n\n<p>The amount of mass lost by stars during the red-giant branch (RGB) phase is one of the main parameters to correctly study later stages of stellar evolution. In spite of its importance, a fully-comprehensive understanding of this phenomenon is still missing and we mostly rely on empirical formulations. The Galactic Globular Clusters (GCs) are ideal targets to derive such formulations of mass loss, but the presence of multiple populations has been a major challenge.<br>\nWe combine Hubble Space Telescope photometry with stellar evolutionary models, to analyse the horizontal branch (HB) stars in 53 GCs. We constrained the helium abundance for the first and the &ldquo;extreme&rdquo; second generations stars using independent measurements based on the RGB. With these new constrains the parameters degeneracy traditionally associated to these stars has been broken for the first time.</p>\n\n<p>Our main results are: the mass loss of first generation stars is tightly correlated with cluster metallicity; the location of helium enriched stars on the HB is reproduced only by adopting a higher RGB mass loss, compared to the first generation; and, finally, the difference in mass loss tightly correlates with helium enhancement and cluster mass.</p>\n\n<p>&nbsp;</p>", 
    "license": {
      "id": "CC-BY-4.0"
    }, 
    "title": "Mass-loss from multiple populations: hint of a universal mass loss-law for Pop II stars?", 
    "notes": "6 figures", 
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    "keywords": [
      "Stars", 
      "Horizontal Branch", 
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    "publication_date": "2021-02-26", 
    "creators": [
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        "orcid": "0000-0002-1128-098X", 
        "affiliation": "Univesit\u00e0 di Padova", 
        "name": "Tailo Marco"
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      {
        "affiliation": "Univesit\u00e0 di Padova", 
        "name": "Antonino P. Milone"
      }, 
      {
        "affiliation": "Univesit\u00e0 di Padova", 
        "name": "Edoardo P. Lagioia"
      }, 
      {
        "affiliation": "Inaf OA Roma", 
        "name": "Francesca D'Antona"
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      {
        "affiliation": "Univesit\u00e0 di Padova", 
        "name": "Sohee Jang"
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      {
        "affiliation": "Indiana University", 
        "name": "Enrico Vesperini"
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        "affiliation": "Inaf OA Arcetri", 
        "name": "Anna F. Marino"
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        "affiliation": "Inaf OA Roma", 
        "name": "Paolo Ventura"
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      {
        "affiliation": "INAF IASF Roma", 
        "name": "Vittoria Caloi"
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      {
        "affiliation": "Univesit\u00e0 di Padova", 
        "name": "Marilia  Carlos"
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        "affiliation": "Univesit\u00e0 di Padova", 
        "name": "Giacomo Cordoni"
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        "name": "Emanuele Dondoglio"
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        "affiliation": "Univesit\u00e0 di Padova", 
        "name": "Anjana Mohandasan"
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        "affiliation": "Univesit\u00e0 di Padova", 
        "name": "J. Ephrem Nastasio"
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      {
        "affiliation": "Univesit\u00e0 di Padova", 
        "name": "Maria Vittoria Legnardi"
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