M33 Cepheids from CFHT/MegaCam Survey
In this paper we analyze Sloan g, r, i archival imaging data of M33 taken by Hartman et al. using MegaCam at the Canada–France–Hawaii Telescope. To determine the distance to the M33 galaxy, we performed several analytical steps to identify its Cepheid population. We used the Lomb–Scargle algorithm t...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2022-01-01
|
| Series: | The Astronomical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-3881/aca151 |
| _version_ | 1827826796103467008 |
|---|---|
| author | Samuel Adair Chien-Hsiu Lee |
| author_facet | Samuel Adair Chien-Hsiu Lee |
| author_sort | Samuel Adair |
| collection | DOAJ |
| description | In this paper we analyze Sloan g, r, i archival imaging data of M33 taken by Hartman et al. using MegaCam at the Canada–France–Hawaii Telescope. To determine the distance to the M33 galaxy, we performed several analytical steps to identify its Cepheid population. We used the Lomb–Scargle algorithm to find periodicity and visually identified 1989 periodic variable stars. Since Cepheids occupy a specific region of the color–magnitude diagram, to differentiate Cepheids from other variables we used the expected position of the Cepheid instability strip to down-select Cepheids in M33 from other variables. This led to our sample of 1622 variables, the largest Cepheid sample known in M33 to date. We further classified these Cepheids into different subclasses, and used the fundamental mode Cepheids to estimate distance moduli for M33 in different filters: μ = 25.044 ± 0.083 mag in the g filter, μ = 24.886 ± 0.074 mag in the r filter, and μ = 24.785 ± 0.068 mag for the i filter. These results are in agreement with previous results. |
| first_indexed | 2024-03-12T03:17:28Z |
| format | Article |
| id | doaj.art-d73eb75bae7e4e9eb9c9b2618ad8dd12 |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-12T03:17:28Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-d73eb75bae7e4e9eb9c9b2618ad8dd122023-09-03T14:08:26ZengIOP PublishingThe Astronomical Journal1538-38812022-01-0116512810.3847/1538-3881/aca151M33 Cepheids from CFHT/MegaCam SurveySamuel Adair0Chien-Hsiu Lee1University of Hawaii at Hilo , Hilo, HI 96740, USAW. M. Keck Observatory , Kamuela, HI 96743, USAIn this paper we analyze Sloan g, r, i archival imaging data of M33 taken by Hartman et al. using MegaCam at the Canada–France–Hawaii Telescope. To determine the distance to the M33 galaxy, we performed several analytical steps to identify its Cepheid population. We used the Lomb–Scargle algorithm to find periodicity and visually identified 1989 periodic variable stars. Since Cepheids occupy a specific region of the color–magnitude diagram, to differentiate Cepheids from other variables we used the expected position of the Cepheid instability strip to down-select Cepheids in M33 from other variables. This led to our sample of 1622 variables, the largest Cepheid sample known in M33 to date. We further classified these Cepheids into different subclasses, and used the fundamental mode Cepheids to estimate distance moduli for M33 in different filters: μ = 25.044 ± 0.083 mag in the g filter, μ = 24.886 ± 0.074 mag in the r filter, and μ = 24.785 ± 0.068 mag for the i filter. These results are in agreement with previous results.https://doi.org/10.3847/1538-3881/aca151Triangulum GalaxyCepheid variable starsDistance indicators |
| spellingShingle | Samuel Adair Chien-Hsiu Lee M33 Cepheids from CFHT/MegaCam Survey The Astronomical Journal Triangulum Galaxy Cepheid variable stars Distance indicators |
| title | M33 Cepheids from CFHT/MegaCam Survey |
| title_full | M33 Cepheids from CFHT/MegaCam Survey |
| title_fullStr | M33 Cepheids from CFHT/MegaCam Survey |
| title_full_unstemmed | M33 Cepheids from CFHT/MegaCam Survey |
| title_short | M33 Cepheids from CFHT/MegaCam Survey |
| title_sort | m33 cepheids from cfht megacam survey |
| topic | Triangulum Galaxy Cepheid variable stars Distance indicators |
| url | https://doi.org/10.3847/1538-3881/aca151 |
| work_keys_str_mv | AT samueladair m33cepheidsfromcfhtmegacamsurvey AT chienhsiulee m33cepheidsfromcfhtmegacamsurvey |