Browsing Institutt for teoretisk astrofysikk by Author "Saberi, Maryam"

Now showing items 1-8 of 8

  • CO and HCN isotopologue ratios in the outflows of AGB stars 
    Saberi, Maryam; Olofsson, Hans; Vlemmings, Wouter H.T.; de Beck, Elivire; Khouri, Theo; Ramstedt, Sofia (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. Isotopologue line intensity ratios of circumstellar molecules have been widely used to trace the photospheric elemental isotopic ratios of evolved stars. However, depending on the molecular species and the physical ...
  • DEATHSTAR: nearby AGB stars with the Atacama Compact Array. II. CO envelope sizes and asymmetries: the S-type stars 
    Andriantsaralaza, Miora; Ramstedt, S.; Vlemmings, W. H. T.; Danilovich, T.; De Beck, E.; Groenewegen, M.; Höfner, S.; Kerschbaum, F.; Khouri, T.; Lindqvist, M.; Maercker, M.; Olofsson, H.; Quintana-Lacaci, G.; Saberi, Maryam; Sahai, R.; Zijlstra, A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Aims. We aim to constrain the sizes of, and investigate deviations from spherical symmetry in, the CO circumstellar envelopes (CSEs) of 16 S-type stars, along with an additional 7 and 4 CSEs of C-type and M-type AGB stars, ...
  • EMISSA (Exploring Millimeter Indicators of Solar-Stellar Activity) II. Towards a robust indicator of stellar activity 
    Mohan, Atul; Wedemeyer, Sven; Hauschildt, Peter, H.; Pandit, Sneha; Saberi, Maryam (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Context: An activity indicator, which can provide a robust quantitative mapping between the stellar activity and the physical properties of its atmosphere, is important in exploring the evolution of the observed active ...
  • EMISSA (Exploring Millimeter Indicators of Solar-Stellar Activity): I. The initial millimeter–centimeter main-sequence star sample 
    Mohan, Atul; Wedemeyer, Sven; Pandit, Sneha; Saberi, Maryam; Hauschildt, Peter H. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Context. Due to their wide wavelength coverage across the millimeter to centimeter (mm–cm) range and their increased sensitivity, modern interferometric arrays facilitate observations of the thermal and non-thermal radiation ...
  • First detection of AlF line emission towards M-type AGB stars 
    Saberi, Maryam; Khouri, T.; Velilla-Prieto, L.; Fonfría, J.P.; Vlemmings, W.H.T.; Wedemeyer, Sven (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The nucleosynthesis production of fluorine (F) is still a matter of debate. Asymptotic giant branch (AGB) stars are one of the main candidates for F production. However, their contribution to the total F budget is not fully ...
  • Reflections on the photodissociation of CO in circumstellar envelopes 
    Groenewegen, Martin; Saberi, Maryam (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Carbon monoxide (CO) is the most abundant molecule after molecular hydrogen and is important for the chemistry in circumstellar envelopes around evolved stars. When modelling the strength and shape of molecular lines, the ...
  • The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. V. The Star Formation History of Sagittarius Dwarf Irregular Galaxy Derived from Long-period Variable Stars 
    Parto, Tahere; Dehghani, Shahrzad; Javadi, Atefeh; Saremi, Elham; van Loon, Jacco Th.; Khosroshahi, Habib G.; McDonald, Iain; Mirtorabi, Mohammad T.; Navabi, Mahdieh; Saberi, Maryam (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    We conducted an optical monitoring survey of the Sagittarius dwarf irregular galaxy (SagDIG) during the period of 2016 June–2017 October, using the 2.5 m Isaac Newton Telescopeat La Palama. Our goal was to identify long-period ...
  • The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. VI. The Star Formation History and Dust Production in Andromeda IX 
    Abdollahi, Hedieh; Javadi, Atefeh; Mirtorabi, Mohammad Taghi; Saremi, Elham; van Loon, Jacco Th.; Khosroshahi, Habib G.; McDonald, Iain; Khalouei, Elahe; Mahani, Hamidreza; Aghdam, Sima Taefi; Saberi, Maryam; Torki, Maryam (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    We present a photometric study of the resolved stellar populations in Andromeda IX (And IX), the closest satellite to M31, a metal-poor and low-mass dwarf spheroidal galaxy. We estimate a distance modulus of ${24.56}_{-0 ...