First results of a photometric and astrometric study 
 of the globular cluster M 71 (NGC 6838)

Geffert, M.; Maintz, Gisela

doi:10.1051/aas:2000209

Cited by 20 publications

(28 citation statements)

References 13 publications

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“…This value is in good agreement with (but more accurate than) the previous determination (Geffert & Maintz 2000), and it remains unchanged within the errors even if the two candidate AGNs are excluded from the analysis: in that case we get(…”

Section: Absolute Pmssupporting

confidence: 89%

“…The VPD in the absolute frame is plotted in Figure 9, with the red and green crosses and circles marking, respectively, the absolute PM and its uncertainty as determined in this study and as quoted in Geffert & Maintz (2000).…”

Section: Absolute Pmsmentioning

confidence: 98%

“…75, 4 . 56), likely on a disk-like orbit (Geffert & Maintz 2000). Hence, it could have lost a substantial fraction of its initial mass, due to heavy interactions with the Galactic field and to shocks caused by encounters with molecular clouds and/or spiral arms.…”

Section: Introductionmentioning

confidence: 99%

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Proper Motions and Structural Parameters of the Galactic Globular Cluster M71*

Cadelano

Dalessandro

Ferraro

et al. 2017

ApJ

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Abstract By exploiting two ACS/HST data sets separated by a temporal baseline of ∼7 years, we have determined the relative stellar proper motions (PMs; providing membership) and the absolute PM of the Galactic globular cluster M71. The absolute PM has been used to reconstruct the cluster orbit within a Galactic, three-component, axisymmetric potential. M71 turns out to be in a low-latitude disk-like orbit inside the Galactic disk, further supporting the scenario in which it lost a significant fraction of its initial mass. Since large differential reddening is known to affect this system, we took advantage of near-infrared, ground-based observations to re-determine the cluster center and density profile from direct star counts. The new structural parameters turn out to be significantly different from the ones quoted in the literature. In particular, M71 has a core and a half-mass radii almost 50% larger than previously thought. Finally, we estimate that the initial mass of M71 was likely one order of magnitude larger than its current value, thus helping to solve the discrepancy with the observed number of X-ray sources.

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Section: Absolute Pmssupporting

confidence: 89%

Section: Absolute Pmsmentioning

confidence: 98%

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Proper Motions and Structural Parameters of the Galactic Globular Cluster M71*

Cadelano

Dalessandro

Ferraro

et al. 2017

ApJ

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“…Together with NGC 6626, NGC 6752 (Dinescu et al 1999) and M 71, which has according to Geffert & Maintz (2000) a much higher age, M 10 establishes a group of high age globular clusters with orbits of a disk or thick disk character. This result would imply that at the time when the oldest globular clusters were born, the Milky Way had already a gas distribution with a disk component, where the gas enabled the formation of clusters.…”

Section: Discussionmentioning

confidence: 97%

A proper motion study of the globular cluster M 10

Chen

Geffert

Wang

et al. 2000

Astron. Astrophys. Suppl. Ser.

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Abstract. We present the first proper motion study of M 10 (NGC 6254). Absolute proper motions of about 532 stars in the field of the globular cluster M 10 were determined with respect to Hipparcos and ACT reference stars. In addition to photographic plates of Bonn and Shanghai also wide field CCD observations as second epoch plates were used. The wide field CCD observations show an accuracy comparable to that of the photographic plates. A good coincidence of the solutions based on reference stars from Hipparcos and from ACT was found. Our final proper motions allow a sufficient separation of cluster and field stars. Two population II Cepheids were confirmed to be members of M 10. The absolute proper motion of M 10 was determined and combined with its distance from the Sun and its radial velocity. The space motion and metallicity of M 10 indicates the characteristics of a halo object with an orbit reaching to a maximal z-distance of less than 3 kpc.

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“…M71 is a low-density GC (log 2.83 0 r = in units of L e pc −3 ; Harris 1996), in a disk-like orbit (Geffert & Maintz 2000), located at ∼4 kpc from the Earth. It is one of the most metal-rich clusters among halo GCs (Harris 1996) and its surface brightness profile shows an extended core (r c =37″.…”

Section: Introductionmentioning

confidence: 99%

Effect of Plasma Gases on Insulating Properties of Low-Temperature-Deposited SiOCH Films Prepared by Remote Plasma-Enhanced Chemical Vapor Deposition

Yamaoka

Okada

Yoshizako

et al. 2007

jjap

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We report on the determination of the astrometric, spin, and orbital parameters for PSR J1953+1846 A, a "black widow" binary millisecond pulsar in the globular cluster M71. By using the accurate position and orbital parameters obtained from radio timing, we identified the optical companion in Advanced Camera for Surveys/ Hubble Space Telescope images. It turns out to be a faint (m 24 F606W  , m 23 F814W  ) and variable star located at only ∼0″. 06 from the pulsar timing position. The light curve shows a maximum at the pulsar inferior conjunction and a minimum at the pulsar superior conjunction, thus confirming the association with the system. The shape of the optical modulation suggests that the companion star is heated, likely by the pulsar wind. The comparison with the X-ray light curve possibly suggests the presence of an intra-binary shock due to the interaction between the pulsar wind and the material released by the companion. This is the second identification (after COM-M5C) of an optical companion to a black widow pulsar in a globular cluster. Interestingly, the two companions show a similar light curve and share the same position in the color-magnitude diagram.

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First results of a photometric and astrometric study of the globular cluster M 71 (NGC 6838)

Cited by 20 publications

References 13 publications

Proper Motions and Structural Parameters of the Galactic Globular Cluster M71*

Proper Motions and Structural Parameters of the Galactic Globular Cluster M71*

A proper motion study of the globular cluster M 10

Effect of Plasma Gases on Insulating Properties of Low-Temperature-Deposited SiOCH Films Prepared by Remote Plasma-Enhanced Chemical Vapor Deposition

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