The Trigonometric Parallax of the Hyades Cluster

Altena, W. F. van; Lee, J. T.; Hoffleit, E. D.

doi:10.1515/astro-1997-0107

Cited by 3 publications

(6 citation statements)

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“…1. an average distance for these seven members, D = 47.5 pc with individual parallax errors lower by an average factor of 4.5 compared to the original study (van Altena et al 1997a) and a factor of 11 times better than Hipparcos for the four stars in common, 2. a ±1−σ dispersion depth of 3.6 pc, and a minimum diameter 16.0 ± 0.9 pc, 3. absolute magnitudes for each member, yielding a sparsely populated main sequence, 4. a weighted average distance modulus of m-M=3.376 ± 0.01, a value that agrees within the errors to results from the orbital parallaxes of Hyades binaries (Torres et al 1997a,b,c), and is very close to both Hipparcos results (Perryman et al 1998;van Leeuwen 2009) , 5. an independent parallax and distance modulus for the Hyades confirming the assertion of Narayanan & Gould (1999b) that Hipparcos 'got it right'.…”

Section: Discussionmentioning

confidence: 56%

“…We have reanalyzed older FGS 3 data of six fields and supplemental newer FGS1r astrometric data of two fields in the Hyades, containing seven confirmed Hyads. We employ techniques (Harrison et al 1999;Benedict et al 2007b) devised since the original analysis (van Altena et al 1997a). These new absolute parallaxes now provide:…”

Section: Discussionmentioning

confidence: 99%

“…The parallaxes from the previous analysis of HST FGS data (van Altena et al 1997a); our new analysis, including newer data (Section 4.1); the original Hipparcos results (Perryman et al 1997); and the recent re-reduction of the Hipparcos data (van Leeuwen 2007Leeuwen , 2009 are collected in Table 8.…”

Section: Modeling Notes On the Other Hyadsmentioning

confidence: 99%

“…Reference Frame Statistics and Hyad Parallax and Proper Motion Parallaxes from the original analysis(van Altena et al 1997a) …”

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confidence: 99%

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ASTROMETRY WITH THEHUBBLE SPACE TELESCOPE: TRIGONOMETRIC PARALLAXES OF SELECTED HYADS

McArthur¹,

Benedict²,

Harrison

et al. 2011

The Astronomical Journal

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We present absolute parallaxes and proper motions for seven members of the Hyades open cluster, pre-selected to lie in the core of the cluster. Our data come from archival astrometric data from FGS 3, and newer data for 3 Hyads from FGS 1R, both white-light interferometers on the Hubble Space Telescope (HST). We obtain member parallaxes from six individual Fine Guidance Sensor (FGS) fields and use the field containing van Altena 622 and van Altena 627 (= HIP 21138) as an example. Proper motions, spectral classifications and VJHK photometry of the stars comprising the astrometric reference frames provide spectrophotometric estimates of reference star absolute parallaxes. Introducing these into our model as observations with error, we determine absolute parallaxes for each Hyad. The parallax of vA 627 is significantly improved by including a perturbation orbit for this previously known spectroscopic binary, now an astrometric binary. Compared to our original (1997) determinations, a combination of new data, updated calibration, and improved analysis lowered the individual parallax errors by an average factor of 4.5. Comparing parallaxes of the four stars contained in the Hipparcos catalog, we obtain an average factor of 11 times improvement with the HST . With these new results, we also have better agreement with Hipparcos for the four stars in common. These new parallaxes provide an average distance for these seven members, < D > = 47.5 pc, for the core a ±1 − σ dispersion depth of 3.6 pc, and a minimum depth from individual components of 16.0 ± 0.9 pc. Absolute magnitudes for each member are compared to established main sequences, with excellent agreement. We obtain a weighted average distance modulus for the core of the Hyades of m-M=3.376 ± 0.01, a value close to the previous Hipparcos values, m-M=3.33±0.02.

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Section: Modeling Notes On the Other Hyadsmentioning

confidence: 99%

“…Reference Frame Statistics and Hyad Parallax and Proper Motion Parallaxes from the original analysis(van Altena et al 1997a) …”

mentioning

confidence: 99%

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ASTROMETRY WITH THEHUBBLE SPACE TELESCOPE: TRIGONOMETRIC PARALLAXES OF SELECTED HYADS

McArthur¹,

Benedict²,

Harrison

et al. 2011

The Astronomical Journal

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“…However, its distance and therefore most of its other parameters are not well determined. Prior to the Hipparcos Catalogue the most up-to-date published parallax for Betelgeuse was π = 9.8 ± 4.7 mas (d ∼ 102 pc) from the Fourth Edition of the Yale Trigonometric Parallaxes (van Altena et al 1995), while the Hipparcos Input Catalogue, Version 2 (ESA 1993) gives a trigonometric parallax of π = 5 ± 4 mas (d ∼ 200 pc). A summary of pre-Hipparcos stellar motions and parallax is given in Table 1.…”

Section: Introductionmentioning

confidence: 99%

A NEW VLA-HIPPARCOSDISTANCE TO BETELGEUSE AND ITS IMPLICATIONS

Harper

Brown

Guinan

2008

The Astronomical Journal

108

161

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The distance to the M supergiant Betelgeuse is poorly known, with the Hipparcos parallax having a significant uncertainty. For detailed numerical studies of M supergiant atmospheres and winds, accurate distances are a prerequisite to obtaining reliable estimates for many stellar parameters. New high spatial resolution, multiwavelength, NRAO 3 Very Large Array (VLA) radio positions of Betelgeuse have been obtained and then combined with Hipparcos Catalogue Intermediate Astrometric Data to derive new astrometric solutions. These new solutions indicate a smaller parallax, and hence greater distance (197 ± 45 pc), than that given in the original Hipparcos Catalogue (131 ± 30 pc) and in the revised Hipparcos reduction. They also confirm smaller proper motions in both right ascension and declination, as found by previous radio observations. We examine the consequences of the revised astrometric solution on Betelgeuse's interaction with its local environment, on its stellar properties, and its kinematics. We find that the most likely star-formation scenario for Betelgeuse is that it is a runaway star from the Ori OB1 association and was originally a member of a high-mass multiple system within Ori OB1a.

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Age Determinations of the Hyades, Praesepe, and Pleiades via MESA Models with Rotation

Gossage

Conroy

Dotter

et al. 2018

ApJ

136

123

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The Hyades, Praesepe, and Pleiades are well studied stellar clusters that anchor important secondary stellar age indicators. Recent studies have shown that main sequence turn off-based ages for these clusters may depend on the degree of rotation in the underlying stellar models. Rotation induces structural instabilities that can enhance the chemical mixing of a star, extending its fuel supply. In addition, rotation introduces a modulation of the star's observed magnitude and color due to the effects of gravity darkening. We aim to investigate the extent to which stellar rotation affects the age determination of star clusters. We utilize the MESA stellar evolution code to create models that cover a range of rotation rates corresponding to Ω/Ω c = 0.0 to 0.6 in 0.1 dex steps, allowing the assessment of variations in this dimension. The statistical analysis package, MATCH, is employed to derive ages and metallicities by fitting our MESA models to Tycho B T , V T and 2MASS J, K s colormagnitude diagrams. We find that the derived ages are relatively insensitive to the effects of rotation. For the Hyades, Praesepe, and Pleiades, we derive ages based on synthetic populations that model a distribution of rotation rates or a fixed rate. Across each case, derived ages tend to agree roughly within errors, near 680, 590, and 110 − 160 Myr for the Hyades, Praesepe, and Pleiades, respectively. These ages are in agreement with Li depletion boundary-based ages and previous analyses that used non-rotating isochrones. Our methods do not provide a strong constraint on the metallicities of these clusters.

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The Trigonometric Parallax of the Hyades Cluster

Cited by 3 publications

References 0 publications

ASTROMETRY WITH THEHUBBLE SPACE TELESCOPE: TRIGONOMETRIC PARALLAXES OF SELECTED HYADS

ASTROMETRY WITH THEHUBBLE SPACE TELESCOPE: TRIGONOMETRIC PARALLAXES OF SELECTED HYADS

A NEW VLA-HIPPARCOSDISTANCE TO BETELGEUSE AND ITS IMPLICATIONS

Age Determinations of the Hyades, Praesepe, and Pleiades via MESA Models with Rotation

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