Deep Hubble Space Telescope WFPC2 photometry of NGC 288. I. Binary systems and blue stragglers

Michele Bellazzini, Flavio Fusi Pecci, Maria Messineo, Lorenzo Monaco, Robert T. Rood

Resultado de la investigación: Article

78 Citas (Scopus)

Resumen

We present the first results of a deep WFPC2 photometric survey of the loose galactic globular cluster NGC 288. The fraction of binary systems is estimated from the color distribution of objects near the main sequence (MS) with a method analogous to that introduced by Rubenstein & Bailyn. We have unequivocally detected a significant population of binary systems with a radial distribution that has been significantly influenced by mass segregation. In the inner region of the cluster (r < 1rh ≃ 1.6rc) the binary fraction (fb) lies in the range 0.08-0.38 regardless of the assumed distribution of mass ratios, F(q). The most probable fb lies between 0.10 and 0.20 depending on the adopted F(q). On the other hand, in the outer region (r ≥ 1rh), fb must be less than 0.10, and the most likely value is 0.0, independently of the adopted F(q). The detected population of binaries is dominated by primordial systems. The specific frequency of blue stragglers (BSs) is exceptionally high, suggesting that the BS production mechanism via binary evolution can be very efficient. A large population of BSs is possible even in low-density environments if a sufficient reservoir of primordial binaries is available. The observed distribution of BSs in the color-magnitude diagram is not compatible with a rate of BS production that has been constant in time, if it is assumed that all the BSs are formed by the merging of two stars.

Idioma originalEnglish
Páginas (desde-hasta)1509-1527
Número de páginas19
PublicaciónAstronomical Journal
Volumen123
N.º3 1755
DOI
EstadoPublished - 1 mar 2002

Huella dactilar

Hubble Space Telescope
photometry
color-magnitude diagram
globular clusters
radial distribution
mass ratios
color
stars
diagram
distribution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Bellazzini, Michele ; Fusi Pecci, Flavio ; Messineo, Maria ; Monaco, Lorenzo ; Rood, Robert T. / Deep Hubble Space Telescope WFPC2 photometry of NGC 288. I. Binary systems and blue stragglers. En: Astronomical Journal. 2002 ; Vol. 123, N.º 3 1755. pp. 1509-1527.
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abstract = "We present the first results of a deep WFPC2 photometric survey of the loose galactic globular cluster NGC 288. The fraction of binary systems is estimated from the color distribution of objects near the main sequence (MS) with a method analogous to that introduced by Rubenstein & Bailyn. We have unequivocally detected a significant population of binary systems with a radial distribution that has been significantly influenced by mass segregation. In the inner region of the cluster (r < 1rh ≃ 1.6rc) the binary fraction (fb) lies in the range 0.08-0.38 regardless of the assumed distribution of mass ratios, F(q). The most probable fb lies between 0.10 and 0.20 depending on the adopted F(q). On the other hand, in the outer region (r ≥ 1rh), fb must be less than 0.10, and the most likely value is 0.0, independently of the adopted F(q). The detected population of binaries is dominated by primordial systems. The specific frequency of blue stragglers (BSs) is exceptionally high, suggesting that the BS production mechanism via binary evolution can be very efficient. A large population of BSs is possible even in low-density environments if a sufficient reservoir of primordial binaries is available. The observed distribution of BSs in the color-magnitude diagram is not compatible with a rate of BS production that has been constant in time, if it is assumed that all the BSs are formed by the merging of two stars.",
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Deep Hubble Space Telescope WFPC2 photometry of NGC 288. I. Binary systems and blue stragglers. / Bellazzini, Michele; Fusi Pecci, Flavio; Messineo, Maria; Monaco, Lorenzo; Rood, Robert T.

En: Astronomical Journal, Vol. 123, N.º 3 1755, 01.03.2002, p. 1509-1527.

Resultado de la investigación: Article

TY - JOUR

T1 - Deep Hubble Space Telescope WFPC2 photometry of NGC 288. I. Binary systems and blue stragglers

AU - Bellazzini, Michele

AU - Fusi Pecci, Flavio

AU - Messineo, Maria

AU - Monaco, Lorenzo

AU - Rood, Robert T.

PY - 2002/3/1

Y1 - 2002/3/1

N2 - We present the first results of a deep WFPC2 photometric survey of the loose galactic globular cluster NGC 288. The fraction of binary systems is estimated from the color distribution of objects near the main sequence (MS) with a method analogous to that introduced by Rubenstein & Bailyn. We have unequivocally detected a significant population of binary systems with a radial distribution that has been significantly influenced by mass segregation. In the inner region of the cluster (r < 1rh ≃ 1.6rc) the binary fraction (fb) lies in the range 0.08-0.38 regardless of the assumed distribution of mass ratios, F(q). The most probable fb lies between 0.10 and 0.20 depending on the adopted F(q). On the other hand, in the outer region (r ≥ 1rh), fb must be less than 0.10, and the most likely value is 0.0, independently of the adopted F(q). The detected population of binaries is dominated by primordial systems. The specific frequency of blue stragglers (BSs) is exceptionally high, suggesting that the BS production mechanism via binary evolution can be very efficient. A large population of BSs is possible even in low-density environments if a sufficient reservoir of primordial binaries is available. The observed distribution of BSs in the color-magnitude diagram is not compatible with a rate of BS production that has been constant in time, if it is assumed that all the BSs are formed by the merging of two stars.

AB - We present the first results of a deep WFPC2 photometric survey of the loose galactic globular cluster NGC 288. The fraction of binary systems is estimated from the color distribution of objects near the main sequence (MS) with a method analogous to that introduced by Rubenstein & Bailyn. We have unequivocally detected a significant population of binary systems with a radial distribution that has been significantly influenced by mass segregation. In the inner region of the cluster (r < 1rh ≃ 1.6rc) the binary fraction (fb) lies in the range 0.08-0.38 regardless of the assumed distribution of mass ratios, F(q). The most probable fb lies between 0.10 and 0.20 depending on the adopted F(q). On the other hand, in the outer region (r ≥ 1rh), fb must be less than 0.10, and the most likely value is 0.0, independently of the adopted F(q). The detected population of binaries is dominated by primordial systems. The specific frequency of blue stragglers (BSs) is exceptionally high, suggesting that the BS production mechanism via binary evolution can be very efficient. A large population of BSs is possible even in low-density environments if a sufficient reservoir of primordial binaries is available. The observed distribution of BSs in the color-magnitude diagram is not compatible with a rate of BS production that has been constant in time, if it is assumed that all the BSs are formed by the merging of two stars.

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