Blastocyst cryopreservation: an update

Behr, Barry; Gebhardt, J.; Milki, Amin A.

doi:10.1016/s0015-0282(03)01274-3

Cited by 17 publications

(32 citation statements)

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“…For NGC 6205, we were able to compare our results with abundance determinations from the literature. The ∆a values of three HB stars, one without chemical peculiarities, listed in Behr (2003), are in perfect agreement. The peculiar objects were clearly detected with +57 and +60 mmag, whereas the non-peculiar object does not stand out.…”

Section: Discussionmentioning

confidence: 57%

The first Δa observations of three globular clusters

Paunzen

Iliev

Pintado³

et al. 2014

Monthly Notices of the Royal Astronomical Society

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Globular clusters are main astrophysical laboratories to test and modify evolutionary models. Thought to be rather homogeneous in their local elemental distribution of members, results suggest a wide variety of chemical peculiarities. Besides different main sequences, believed to be caused by different helium abundances, peculiarities of blue horizontal-branch stars and on the red giant branch were found. This whole zoo of peculiar objects has to be explained in the context of stellar formation and evolution. The tool of ∆a photometry is employed in order to detect peculiar stars in the whole spectral range. This three filter narrow band system measures the flux distribution in the region from 4900 to 5600Å in order to find any peculiarities around 5200Å. It is highly efficient to detect classical chemically peculiar stars of the upper main sequence, Be/Ae, shell and metal-weak objects in the Milky Way and Magellanic Clouds. We present ∆a photometry of 2266 stars from 109 individual frames for three globular clusters (NGC 104, NGC 6205, and NGC 7099). A comparison with published abundances, for three horizontal-branch stars, only, yield an excellent agreement. According to the 3σ detection limit of each globular cluster, about 3% of the stars lie in abnormal regions in the diagnostic diagrams. The first observations of three widely different aggregates give very promising results, which will serve as a solid basis for follow-up observations including photometric as well as spectroscopic studies.

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Section: Discussionmentioning

confidence: 57%

The first Δa observations of three globular clusters

Paunzen

Iliev

Pintado³

et al. 2014

Monthly Notices of the Royal Astronomical Society

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“…Figures 6 and 7 simulate the effects of radiative levitation in BHB stars by assuming a super-solar metallicity between the G-jump and M-jump. The evidence for radiative levitation blueward of the G-jump is well supported by spectroscopy of BHB stars (e.g., Moehler et al 1999Moehler et al , 2000Behr 2003;Pace et al 2006). In the CCP, the observed HB locus returns to alignment with the standard ZAHB distribution (i.e., with no atmospheric enhancement of metallicity) blueward of the M-jump, but the complete cessation of radiative levitation cannot be the origin of the M-jump; instead, some other effect is likely counterbalancing the deviation associated with radiative levitation.…”

Section: Caveatsmentioning

confidence: 65%

The Hubble Space Telescope Uv Legacy Survey of Galactic Globular Clusters. Vii. Implications From the Nearly Universal Nature of Horizontal Branch Discontinuities*

Brown

Cassisi

D’Antona

et al. 2016

ApJ

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The UV-initiative Hubble Space Telescope Treasury survey of Galactic globular clusters provides a new window into the phenomena that shape the morphological features of the horizontal branch (HB). Using this large and homogeneous catalog of UV and blue photometry, we demonstrate that the HB exhibits discontinuities that are remarkably consistent in color (effective temperature). This consistency is apparent even among some of the most massive clusters hosting multiple distinct sub-populations (such as NGC 2808, ω Cen, and NGC 6715), demonstrating that these phenomena are primarily driven by atmospheric physics that is independent of the underlying population properties. However, inconsistencies arise in the metal-rich clusters NGC6388 and NGC6441, where the discontinuity within the blue HB (BHB) distribution shifts ∼1000-2000 K hotter. We demonstrate that this shift is likely due to a large helium enhancement in the BHB stars of these clusters, which in turn affects the surface convection and evolution of such stars. Our survey also increases the number of Galactic globular clusters known to host blue-hook stars (also known as late hot flashers) from 6 to 23 clusters. These clusters are biased toward the bright end of the globular cluster luminosity function, confirming that blue-hook stars tend to form in the most massive clusters with significant self-enrichment.

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“…For instance, 6 of the 7 HB stars of M15 with T eff > 11 000 K observed by Behr et al (1999) (see their Fig. 1 were obtained in many other clusters (Behr et al 2000a;Behr 2003;Moehler et al 2000;Fabbian et al 2005;Pace et al 2006). Furthermore, the hotter HB stars rotate more slowly than the cooler ones that show no abundance anomalies (Behr et al 2000a(Behr et al , 2000bRecio-Blanco et al 2002).…”

Section: Introductionmentioning

confidence: 92%

A search for magnetic fields in cool sdB stars

et al. 2012

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Hot cluster Horizontal Branch (HB) stars and field subdwarf B (sdB) stars are core helium burning stars that exhibit abundance anomalies that are believed to be due to atomic diffusion. Diffusion can be effective in these stars because they are slowly rotating. In particular, the slow rotation of the hot HB stars (T_eff > 11000K), which show abundance anomalies, contrasts with the fast rotation of the cool HB stars, where the observed abundances are consistent with those of red giants belonging to the same cluster. The reason why sdB stars and hot HB stars are rotating slowly is unknown. In order to assess the possible role of magnetic fields on abundances and rotation, we investigated the occurrence of such fields in sdB stars with T_eff < 30000K, whose temperatures overlap with those of the hot HB stars. We conclude that large-scale organised magnetic fields of kG order are not generally present in these stars but at the achieved accuracy, the possibility that they have fields of a few hundred Gauss remains open. We report the marginal detection of such a field in SB 290; further observations are needed to confirm it.Comment: 4 pages, 2 figures, 1 table, to appear in Astronomische Nachrichten, Proceedings of the 7th Potsdam Thinkshop on "Magnetic Fields in Stars and Exoplanets

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Blastocyst cryopreservation: an update

Cited by 17 publications

References 0 publications

The first Δa observations of three globular clusters

The first Δa observations of three globular clusters

The Hubble Space Telescope Uv Legacy Survey of Galactic Globular Clusters. Vii. Implications From the Nearly Universal Nature of Horizontal Branch Discontinuities*

A search for magnetic fields in cool sdB stars

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